Term IRI	Term label	Parent term IRI	Parent term label	Alternative term	Definition
http://purl.obolibrary.org/obo/RO_0002258	developmentally preceded by	http://purl.obolibrary.org/obo/RO_0002324	developmentally related to		Candidate definition: x developmentally related to y if and only if there exists some developmental process (GO:0032502) p such that x and y both participates in p, and x is the output of p and y is the input of p
http://purl.obolibrary.org/obo/RO_0002286	developmentally succeeded by	http://purl.obolibrary.org/obo/RO_0002384	has developmental potential involving		Inverse of developmentally preceded by
http://purl.obolibrary.org/obo/RO_0002384	has developmental potential involving	http://purl.obolibrary.org/obo/RO_0002324	developmentally related to		x has developmental potential involving y iff x is capable of a developmental process with output y. y may be the successor of x, or may be a different structure in the vicinity (as for example in the case of developmental induction).
http://purl.obolibrary.org/obo/RO_0002388	has potential to directly develop into	http://purl.obolibrary.org/obo/RO_0002387	has potential to develop into		x has potential to directly develop into y iff x directly develops into y or x is capable of directly developing into y
http://purl.obolibrary.org/obo/BFO_0000063	precedes	http://purl.obolibrary.org/obo/RO_0002222	temporally related to		x precedes y if and only if the time point at which x ends is before or equivalent to the time point at which y starts. Formally: x precedes y iff ω(x) <= α(y), where α is a function that maps a process to a start point, and ω is a function that maps a process to an end point.
http://purl.obolibrary.org/obo/RO_0000052	characteristic of	http://purl.obolibrary.org/obo/RO_0002314	characteristic of part of		a relation between a specifically dependent continuant (the characteristic) and any other entity (the bearer), in which the characteristic depends on the bearer for its existence.
http://purl.obolibrary.org/obo/RO_0002202	develops from	http://purl.obolibrary.org/obo/RO_0002254	has developmental contribution from		x develops from y if and only if either (a) x directly develops from y or (b) there exists some z such that x directly develops from z and z develops from y
http://purl.obolibrary.org/obo/BFO_0000051	has_part	http://purl.obolibrary.org/obo/RO_0002131	overlaps		a core relation that holds between a whole and its part
http://purl.obolibrary.org/obo/RO_0000087	has role	http://purl.obolibrary.org/obo/RO_0000053	has characteristic		a relation between an independent continuant (the bearer) and a role, in which the role specifically depends on the bearer for its existence
http://purl.obolibrary.org/obo/RO_0002404	causally downstream of	http://purl.obolibrary.org/obo/RO_0002427	causally downstream of or within		inverse of upstream of
http://purl.obolibrary.org/obo/RO_0002304	causally upstream of, positive effect	http://purl.obolibrary.org/obo/RO_0004047	causally upstream of or within, positive effect		p is causally upstream of, positive effect q iff p is casually upstream of q, and the execution of p is required for the execution of q.
http://purl.obolibrary.org/obo/RO_0002305	causally upstream of, negative effect	http://purl.obolibrary.org/obo/RO_0004046	causally upstream of or within, negative effect		p is causally upstream of, negative effect q iff p is casually upstream of q, and the execution of p decreases the execution of q.
http://purl.obolibrary.org/obo/RO_0002131	overlaps	http://purl.obolibrary.org/obo/RO_0002323	mereotopologically related to		x overlaps y if and only if there exists some z such that x has part z and z part of y
http://purl.obolibrary.org/obo/RO_0002254	has developmental contribution from	http://purl.obolibrary.org/obo/RO_0002258	developmentally preceded by		x has developmental contribution from y iff x has some part z such that z develops from y
http://purl.obolibrary.org/obo/RO_0002496	start stage	http://purl.obolibrary.org/obo/RO_0002487	relation between physical entity and a process or stage		x existence starts during or after y if and only if the time point at which x starts is after or equivalent to the time point at which y starts. Formally: x existence starts during or after y iff α (x) >= α (y).
http://purl.obolibrary.org/obo/RO_0002497	end stage	http://purl.obolibrary.org/obo/RO_0002487	relation between physical entity and a process or stage		x existence ends during or before y if and only if the time point at which x ends is before or equivalent to the time point at which y ends.
http://purl.obolibrary.org/obo/BFO_0000062	preceded_by	http://purl.obolibrary.org/obo/RO_0002086	ends after		x is preceded by y if and only if the time point at which y ends is before or equivalent to the time point at which x starts. Formally: x preceded by y iff ω(y) <= α(x), where α is a function that maps a process to a start point, and ω is a function that maps a process to an end point.
http://purl.obolibrary.org/obo/RO_0000081	role of	http://purl.obolibrary.org/obo/RO_0000052	characteristic of		a relation between a role and an independent continuant (the bearer), in which the role specifically depends on the bearer for its existence
http://purl.obolibrary.org/obo/RO_0002411	causally upstream of	http://purl.obolibrary.org/obo/RO_0002418	causally upstream of or within		p is causally upstream of q iff p is causally related to q, the end of p precedes the end of q, and p is not an occurrent part of q.
http://purl.obolibrary.org/obo/RO_0018033	is deprotonated form of	http://purl.obolibrary.org/obo/RO_0018030	chemical relationship		A is a deprotonated form of B if and only if A is chemical entity that is a Brønsted–Lowry Base (i.e., can receive a proton) and by adding some nonzero number of protons transforms it into B.

This is a transitive relationship and follows this design pattern: https://oborel.github.io/obo-relations/direct-and-indirect-relations.
http://purl.obolibrary.org/obo/RO_0018034	is protonated form of	http://purl.obolibrary.org/obo/RO_0018030	chemical relationship		A is a protonated form of B if and only if A is chemical entity that is a Brønsted–Lowry Acid (i.e., can give up a proton) and by removing some nonzero number of protons transforms it into B.

This is a transitive relationship and follows this design pattern: https://oborel.github.io/obo-relations/direct-and-indirect-relations.
http://purl.obolibrary.org/obo/RO_0018036	is tautomer of	http://purl.obolibrary.org/obo/RO_0018030	chemical relationship		Two chemicals are tautomers if they can be readily interconverted.

This commonly refers to prototropy in which a hydrogen's position is changed, such as between ketones and enols. This is also often observed in heterocyclic rings, e.g., ones containing nitrogens and/or have aryl functional groups containing heteroatoms.
http://purl.obolibrary.org/obo/RO_0018037	is substitutent group from	http://purl.obolibrary.org/obo/RO_0018030	chemical relationship		Group A is a substituent group from Chemical B if A represents the functional part of A and includes information about where it is connected. A is not itself a chemical with a fully formed chemical graph, but is rather a partial graph with one or more connection points that can be used to attach to another chemical graph, typically as a functionalization.
http://purl.obolibrary.org/obo/RO_0018038	has functional parent	http://purl.obolibrary.org/obo/RO_0018030	chemical relationship		Chemical A has functional parent Chemical B if there is chemical transformation through which chemical B can be produced from chemical A. 

For example, the relationship between a salt and a freebased compound is a "has functional parent" relationship.
http://purl.obolibrary.org/obo/RO_0018039	is enantiomer of	http://purl.obolibrary.org/obo/RO_0018030	chemical relationship		Chemicals A and B are enantiomers if they share the same molecular graph except the change of the configuration of substituents around exactly one chiral center.

A chemical with no chiral centers can not have an enantiomer. A chemical with multiple chiral centers can have multiple enantiomers, but its enantiomers are not themselves enantiomers (they are diastereomers).
http://purl.obolibrary.org/obo/RO_0018040	has parent hydride	http://purl.obolibrary.org/obo/RO_0018030	chemical relationship		Chemical A has parent hydride Chemical B if there exists a molecular graphical transformation where functional groups on A are replaced with hydrogens in order to yield B.
http://purl.obolibrary.org/obo/BFO_0000050	part of	http://purl.obolibrary.org/obo/RO_0002131	overlaps		a core relation that holds between a part and its whole
http://purl.obolibrary.org/obo/RO_0002211	regulates	http://purl.obolibrary.org/obo/RO_0002411	causally upstream of		p regulates q iff p is causally upstream of q, the execution of p is not constant and varies according to specific conditions, and p influences the rate or magnitude of execution of q due to an effect either on some enabler of q or some enabler of a part of q.
http://purl.obolibrary.org/obo/RO_0002212	negatively regulates	http://purl.obolibrary.org/obo/RO_0002211	regulates		p negatively regulates q iff p regulates q, and p decreases the rate or magnitude of execution of q.
http://purl.obolibrary.org/obo/RO_0002213	positively regulates	http://purl.obolibrary.org/obo/RO_0002211	regulates		p positively regulates q iff p regulates q, and p increases the rate or magnitude of execution of q.
http://purl.obolibrary.org/obo/RO_0002314	characteristic of part of	http://purl.obolibrary.org/obo/RO_0002502	depends on		q characteristic of part of w if and only if there exists some p such that q inheres in p and p part of w.
http://purl.obolibrary.org/obo/RO_0002203	develops into	http://purl.obolibrary.org/obo/RO_0002387	has potential to develop into		inverse of develops from
http://purl.obolibrary.org/obo/RO_0002387	has potential to develop into	http://purl.obolibrary.org/obo/RO_0002384	has developmental potential involving		x has the potential to develop into y iff x develops into y or if x is capable of developing into y
http://purl.obolibrary.org/obo/RO_0002503	towards	http://purl.obolibrary.org/obo/RO_0002502	depends on		q towards e2 if and only if q is a relational quality such that q inheres-in some e, and e != e2 and q is dependent on e2
http://purl.obolibrary.org/obo/RO_0002255	developmentally contributes to	http://purl.obolibrary.org/obo/RO_0002385	has potential to developmentally contribute to		inverse of has developmental contribution from
http://purl.obolibrary.org/obo/RO_0002334	regulated by	http://purl.obolibrary.org/obo/RO_0002427	causally downstream of or within		inverse of regulates
http://purl.obolibrary.org/obo/RO_0002335	negatively regulated by	http://purl.obolibrary.org/obo/RO_0002334	regulated by		inverse of negatively regulates
http://purl.obolibrary.org/obo/RO_0002336	positively regulated by	http://purl.obolibrary.org/obo/RO_0002334	regulated by		inverse of positively regulates
http://purl.obolibrary.org/obo/RO_0002385	has potential to developmentally contribute to	http://purl.obolibrary.org/obo/RO_0002384	has developmental potential involving		x has potential to developmentrally contribute to y iff x developmentally contributes to y or x is capable of developmentally contributing to y
http://purl.obolibrary.org/obo/RO_0002418	causally upstream of or within	http://purl.obolibrary.org/obo/RO_0002501	causal relation between processes		p is 'causally upstream or within' q iff p is causally related to q, and the end of p precedes, or is coincident with, the end of q.
http://purl.obolibrary.org/obo/RO_0002427	causally downstream of or within	http://purl.obolibrary.org/obo/RO_0002501	causal relation between processes		inverse of causally upstream of or within
http://purl.obolibrary.org/obo/RO_0002501	causal relation between processes	http://purl.obolibrary.org/obo/RO_0002410	causally related to		p is causally related to q if and only if p or any part of p and q or any part of q are linked by a chain of events where each event pair is one where the execution of p influences the execution of q. p may be upstream, downstream, part of, or a container of q.
http://purl.obolibrary.org/obo/RO_0002563	interaction relation helper property	http://purl.obolibrary.org/obo/RO_0002464	helper property (not for use in curation)		
http://purl.obolibrary.org/obo/RO_0002564	molecular interaction relation helper property	http://purl.obolibrary.org/obo/RO_0002563	interaction relation helper property		
http://purl.obolibrary.org/obo/RO_0002481	is kinase activity	http://purl.obolibrary.org/obo/RO_0002564	molecular interaction relation helper property		
http://purl.obolibrary.org/obo/RO_0002482	is ubiquitination	http://purl.obolibrary.org/obo/RO_0002564	molecular interaction relation helper property		
http://purl.obolibrary.org/obo/BSPO_0000120	in left side of	http://purl.obolibrary.org/obo/BSPO_0000126	in lateral side of		
http://purl.obolibrary.org/obo/BSPO_0000121	in right side of	http://purl.obolibrary.org/obo/BSPO_0000126	in lateral side of		
http://purl.obolibrary.org/obo/RO_0002086	ends after	http://purl.obolibrary.org/obo/RO_0002222	temporally related to		
http://purl.obolibrary.org/obo/RO_0002091	starts during	http://purl.obolibrary.org/obo/RO_0002222	temporally related to		
http://purl.obolibrary.org/obo/RO_0002093	ends during	http://purl.obolibrary.org/obo/RO_0002222	temporally related to		
http://purl.obolibrary.org/obo/RO_0002084	during which ends	http://purl.obolibrary.org/obo/RO_0002222	temporally related to		
http://purl.obolibrary.org/obo/RO_0002088	during which starts	http://purl.obolibrary.org/obo/RO_0002222	temporally related to		
http://purl.obolibrary.org/obo/RO_0015007	increased in magnitude relative to	http://purl.obolibrary.org/obo/RO_0015006	different in magnitude relative to		
http://purl.obolibrary.org/obo/RO_0015008	decreased in magnitude relative to	http://purl.obolibrary.org/obo/RO_0015006	different in magnitude relative to		
http://purl.obolibrary.org/obo/BSPO_0000126	in lateral side of	http://purl.obolibrary.org/obo/BFO_0000050	part of		
http://purl.obolibrary.org/obo/RO_0002092	happens during	http://purl.obolibrary.org/obo/RO_0002093	ends during		
http://purl.obolibrary.org/obo/RO_0002150	continuous with	http://purl.obolibrary.org/obo/RO_0002323	mereotopologically related to		
http://purl.obolibrary.org/obo/RO_0002085	encompasses	http://purl.obolibrary.org/obo/RO_0002088	during which starts		
http://purl.obolibrary.org/obo/RO_0004046	causally upstream of or within, negative effect	http://purl.obolibrary.org/obo/RO_0002418	causally upstream of or within		
http://purl.obolibrary.org/obo/RO_0004047	causally upstream of or within, positive effect	http://purl.obolibrary.org/obo/RO_0002418	causally upstream of or within		
http://purl.obolibrary.org/obo/RO_0002324	developmentally related to				A relationship that holds between entities participating in some developmental process (GO:0032502)
http://purl.obolibrary.org/obo/BFO_0000067	contains process				[copied from inverse property 'occurs in'] b occurs_in c =def b is a process and c is a material entity or immaterial entity& there exists a spatiotemporal region r and b occupies_spatiotemporal_region r.& forall(t) if b exists_at t then c exists_at t & there exist spatial regions s and s’ where & b spatially_projects_onto s at t& c is occupies_spatial_region s’ at t& s is a proper_continuant_part_of s’ at t
http://purl.obolibrary.org/obo/RO_0000053	has characteristic				Inverse of characteristic_of
http://purl.obolibrary.org/obo/RO_0002573	has modifier				A relation that holds between an attribute or a qualifier and another attribute.
http://purl.obolibrary.org/obo/BFO_0000066	occurs in				b occurs_in c =def b is a process and c is a material entity or immaterial entity& there exists a spatiotemporal region r and b occupies_spatiotemporal_region r.& forall(t) if b exists_at t then c exists_at t & there exist spatial regions s and s’ where & b spatially_projects_onto s at t& c is occupies_spatial_region s’ at t& s is a proper_continuant_part_of s’ at t
http://purl.obolibrary.org/obo/RO_0002323	mereotopologically related to				A mereological relationship or a topological relationship
http://purl.obolibrary.org/obo/RO_0002479	has part that occurs in				p has part that occurs in c if and only if there exists some p1, such that p has_part p1, and p1 occurs in c.
http://purl.obolibrary.org/obo/RO_0002610	correlated with				A relationship that holds between two entities, where the entities exhibit a statistical dependence relationship. The entities may be statistical variables, or they may be other kinds of entities such as diseases, chemical entities or processes.
http://purl.obolibrary.org/obo/RO_0002464	helper property (not for use in curation)				
http://purl.obolibrary.org/obo/RO_0002487	relation between physical entity and a process or stage				
http://purl.obolibrary.org/obo/BSPO_0001102	parallel to				
http://purl.obolibrary.org/obo/BSPO_0000096	anterior to				
http://purl.obolibrary.org/obo/BSPO_0000097	distal to				
http://purl.obolibrary.org/obo/BSPO_0000098	dorsal to				
http://purl.obolibrary.org/obo/BSPO_0000099	posterior to				
http://purl.obolibrary.org/obo/BSPO_0000100	proximal to				
http://purl.obolibrary.org/obo/BSPO_0000102	ventral to				
http://purl.obolibrary.org/obo/BSPO_0000104	approximately perpendicular to				
http://purl.obolibrary.org/obo/BSPO_0000107	deep to				
http://purl.obolibrary.org/obo/BSPO_0000108	superficial to				
http://purl.obolibrary.org/obo/BSPO_0000110	left of				
http://purl.obolibrary.org/obo/BSPO_0000111	right of				
http://purl.obolibrary.org/obo/BSPO_0000113	opposite to				
http://purl.obolibrary.org/obo/BSPO_0015001	finishes axis				
http://purl.obolibrary.org/obo/BSPO_0015003	has axis				
http://purl.obolibrary.org/obo/BSPO_0015005	orthogonal to				
http://purl.obolibrary.org/obo/BSPO_0015007	starts axis				
http://purl.obolibrary.org/obo/BSPO_0015008	surface of				
http://purl.obolibrary.org/obo/RO_0002222	temporally related to				
http://purl.obolibrary.org/obo/RO_0015006	different in magnitude relative to				
http://purl.obolibrary.org/obo/RO_0018030	chemical relationship				
http://purl.obolibrary.org/obo/RO_0002502	depends on				
http://purl.obolibrary.org/obo/RO_0015010	has relative magnitude				
http://purl.obolibrary.org/obo/RO_0015011	has cross section				
http://purl.obolibrary.org/obo/RO_0015012	reciprocal of				
http://purl.obolibrary.org/obo/RO_0002410	causally related to				
