FIGURE 4. Social behaviour of Trpc2^+/- and Trpc2^-/- females in semi-natural conditions.

Stages 1 and 2 show duration of defensive (white) and sexual (grey) behaviours of resident females with each other (stage 1) and towards a C57BL/6J adult male (stage 2). Stage 3 shows duration of sexual behaviour (grey), olfactory investigation (black) and aggression (white) of the resident lactating females towards an intruder CD1 adult male (left two columns) and behaviour of intruder CD1 towards the resident females (right two columns). Stage 4 shows relative time spent by lactating Trpc2^+/- and Trpc2^-/- females in the breeding nest before and after (day 14) the divider was lifted. In the enriched environment Trpc2^-/- females exhibit high levels of male-like sexual behaviour (stages 1 to 2). They exhibit no apparent deficiency in sexual receptivity but show reduction in maternal (stage 3) and lactating behaviour (stage 4). Stages 1–4, error bars are s.e.m.