Fig. 5.

Photomicrographs of spinal motoneurons that innervate the SH (a), SC (b), PEC (c), and ITB (d). Photomicrographs in the left column show cells labeled with fluorescent tracers under UV illumination. Photomicrographs in the right column show the same tissue but viewed under dark-field illumination to illustrate the AR probe hybridization. Photomicrographs in the center column show an overlay of the left and right photomicrographs, demonstrating that fluorescent cells readily express AR mRNA. Arrows point to a representative cell that shows both florescence and silver grain accumulation.