Schematic indicating the developmental profile of βgal and GnRH immunoreactivity in the septohypothalamic, lateral septum, pBNST, and tectal cell populations of the wild-type and GNZ mouse. The gray shading indicates whether GnRH immunoreactivity was detected with all three GnRH antibodies (LR1, SW1, GF6; light gray) or GF6 alone (dark gray).