Odor profiles of the genital secretions in mixed-sex pairs of related and unrelated lemurs. Chromatograms of labial (first column) and scrotal secretions (second column) from three female-male pairs of lemurs during the breeding season. Top row: maternal half-siblings, representing a sister (A) and her brother (B). For this pair, DID = 0.28 and DC = 0.47. Middle row: mother (C) and son (D). For this pair, DID = 0.18 and DC = 0.54. Bottom row: unrelated female (E) and male (F) born in different colonies. For this pair, DID = 0.55 and DC = 1.16. The filled arrow points to the internal standard, hexachlorobenzene, added to the sample before the GCMS run and the open arrow points to the endogenously produced standard, squalene.
Boulet et al. BMC Evolutionary Biology 2009 9:281 doi:10.1186/1471-2148-9-281