Fig. 1. Expression of Brn3a, Brn3b and Brn3c in developing retinas of wild-type and Brn3b^–/– mice. Brn3a, Brn3b, Brn3c and ß-actin transcripts were detected by RT-PCR. Total RNA was collected from wild-type (+/+) and Brn3b^–/– retinas at E14.5 and E16.5. PCR products were visualized by ethidium bromide staining.