In addition, FEV has been shown to be required for correct maternal behaviour in mice, such that their offspring do not survive unless cross-fostered to other wild-type female mice.

• 此外，在小鼠中已经证明，恰当的母性行为需要FEV；因此，如果删除FEV的基因将使它们的后代无法生存，除非由其他的野生型雌性小鼠交叉抚育。