Transverse H&E sections illustrating DES-induced inhibition of MUMP cartilage differentiation in penile specimens harvested at day 10 postnatal (A–D) or at 15 or 20 days postnatal (E and F, respectively). The MUMP cartilage is seen in the oil-treated control (A), and in the DES E12-E18 and the DES P10-P20 specimens (B & F). Impaired MUMP cartilage differentiation is seen in the DES P0-P10, DES E12-P10, and DES P5-P15 groups (C, D & E). All images are at the same magnification. C=cartilage