Mouse urinary proteins provide basis for olfactory genotype discrimination
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http://www.nature.com/ncomms/journal/v4/n3/pdf/ncomms2610.pdf?WT.ec_id=NCOMMS-20130319
"Hence, urinary peptides represent a real-time sampling of the expressed genome available for chemosensory assessment by other individuals." I'm fascinated by this epigenetic aspect. If the same is true for humans, then visual appraisal could signal fitness over the lifespan while pheromones signal current adaptive fitness.
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