In the marble-burying test, lactating mice respond to citalopram treatment that has no effect on nulliparous mice.

<p>All mice were moved to a novel cage for testing. Lactating mice were tested while separated from their pups. Student’s t-test comparisons of the mean: *<i>p</i><0.05 compared to vehicle-treated nulliparous mice; ***<i>p</i><0.001 compared to vehicle-treated lactating group (n = 5–10 per group).