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It's the pelvic thrusts...
Nature reported yesterday on Kimchi et al's (2007) work with Trpc2-/- mice, which suggests that male behavior patterns are inhibited in female mice by smell. The mice were a strain developed to lack the Trpc2 gene, which activates the vomeronasal organ in mice, responsible for the detection of pheromones. Female mice lacking this gene failed to ( Read more... )