Down-propagates. The original name for this in the paper is 'specific_to'. Applicable to genes because some genes are lost in sub-species (strains) of a species.
Down-propagates. The original name for this in the paper is 'specific_to'. Applicable to genes because some genes are lost in sub-species (strains) of a species.
U only_in_taxon T: U is a feature found in only in organisms of species of taxon T. The feature cannot be found in an organism of any species outside of (not subsumed by) that taxon. Down-propagates in U hierarchy, up-propagates in T hierarchy (species taxonomy). Implies applicable_to_taxon.