Relative abundance of volatiles in the urine of male KM mice (mean ± SD), and individual variation (RSD) in their relative abundance in mice from different litters.

A, B, C: individuals from litters A, B and C, respectively, purchased from the Laboratory Animal Center of Academy of Military Medical Sciences. W: individuals of unknown relationship (but unrelated to A, B, or C males) purchased from the Weitong-Lihua Experimental Animal Company.RSD: Relative Standard Deviation.