derives_by_manipulation_from plant_ontology The derives_by_manipulation_from relation, is a special case of the RO relation derives_from. Derives_from implies an instance level derivation that holds between two distinct material continuants when one succeeds the other across a temporal divide in such a way that at least a biologically significant portion of the matter of the earlier continuant is inherited by the later. Likewise, derives_by_manipulation_from joins two plant structures before and after some manipulation. Specifically, derives_by_manipulation_from is used to describe the relation between an in vitro plant structure and the in vivo plant structure that is its temporal precursor. derives_by_manipulation_from 2010-07-01T02:45:12Z PO:0040001 A derives_by_manipulation_from B means: A is a type of in vitro plant structure, and every instance of A exists at a point in time later than some instance of B from which it was created through human manipulation, and every instance of A inherited a biologically significant portion of its matter from the instance of B from which it was derived. derives_by_manipulation_from rwalls