Effects of ablating MnPO/septal NK3R neurons on serum LH (A) and body weight (B). Rats were OVX and injected with blank-SAP (control) or NK3-SAP in the arcuate nucleus on day 0, implanted with subcutaneous E2 capsules on day 22, and killed 11 days later. Serum LH and body weight were markedly increased after 22 days of ovariectomy and reduced by E2 treatment in control rats. Similar changes were seen in NK3-SAP rats; however, the peak levels of serum LH after OVX were slightly reduced compared with those of controls. Body weights were similar between control and NK3-SAP rats. #, P ≤ .05, significantly different, NK3-SAP vs blank-SAP; +, P ≤ .01, significantly different from intact values on day 0; *, P ≤ .01, significantly different after E2 (vs OVX).