Dendritic lengths of 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). Following saporin-induced motoneuron death, surviving nearby motoneurons 66% of their dendritic length. Treatment with either testosterone or DHT attenuated this dendritic atrophy, while treatment with estradiol was ineffective. Bar heights represent means ± SEM. * indicates significantly different from normal controls. † indicates significantly different from untreated saporin-injected animals.