Darkfield photomicrographs of cells in the spinal cord that express AR mRNA. a, Cervical enlargement of a male implanted with T. b, Rostral cervical enlargement and attached DRG of a nonimplanted female. c, Thoracic region well outside the cervical and lumbosacral enlargements in a male implanted with T. d and e, Consecutive sections of the lumbosacral enlargement showing hybridization using the 33P-labeled AR sense probe (d) and the 33P-labeled antisense probe (e). CC, Position of the central canal; W, region of white matter; G, position of gray matter. Reference bar, 40 μm.