obsolete reference gene allele true A version/allele of a gene that serves as a standard against which variant genes are compared. A reference human sonic hedgehog (shh) gene spans bases 155,592,680-155,604,967 on Chromosome 7, according to genome build GRCh37, and produces a primary funcitonal transcript that is 4454 bp in length and produces a 462 amino acid protein involved in cell signaling events behind various aspects of cell differentiation and development. http://useast.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000164690 Note that this may be slightly different than the extend described in other gene databases, such as Entrez Gene:http://www.ncbi.nlm.nih.gov/gene/6469 Being a 'reference gene' is a role or status assigned in the context of a specific dataset or analysis. In human variation datasets, 'reference' status is typically assigned based on factors such as being the most common version/allele in a population, being an ancestral allele, or being indentified first as a prototypical example of a gene. In model organism datasets, 'reference' genes are typically the 'wild-type' allele for a given gene, representing a functional and unaltered version of the gene that is part of a defined genomic background, and against which natural or experimentally-induced versions are compared. Not required at present for any specific use case, so marking as exploratory and obsoleting for simplicity. Eq Class axiom: 'gene allele' and (has_sequence_attribute some reference) SC axioms: is_variant_with some 'gene allele' is_reference_allele_of some gene reference gene