Numbers of thionin-stained SNB motoneurons of normal controls and saporin-injected animals that were either untreated (SAP), or treated with testosterone (SAP+T), estradiol (SAP+E), or DHT (SAP+DHT) for both the BHRP-injected side (filled bars) and the saporin-injected side (open bars). For normal controls, the open bars represent the right half and the filled bars represent the left half of the SNB. Saporin killed more than 60% of the ipsilateral SNB motoneurons, regardless of hormone status, and did not kill contralateral motoneurons. Bar heights represent means ± SEM. * indicates significantly different from normal controls.