obsolete reference single locus complement true reference single locus feature complement Not required at present for any specific use case, so marking as exploratory and obsoleting for simplicity. Eq Class axiom: 'single locus complement' and (has_sequence_attribute some reference) SC axioms: 'has member' exactly 0 'variant allele' 'has member' only 'reference genomic feature' 'has member' some 'reference genomic feature' A single locus complement that serves as a standard against which 'variant' sequences are compared reference allelic complement