Figure 1: Epistatic interactions between QTLs on chromosomes 1 and 7 affecting TOID in female mice (A) and between QTLs on chromosomes 10 and 19 affecting MET in female mice (B). MM = M16i/M16i homozygotes, MF = M16i/FVB heterozygotes, and FF = FVB/FBV homozygotes.