Quantitation of the number of photoreceptor nuclei. Analysis was performed on 3-month-old male and female retinas of the four genotypes: rds,rds:bcl, rds:113, and rds:113+bcl. Data are presented as means ± SEM (n = 6). Males:ap < 0.001, rds:bclversus rds and rds:113. Females:bp < 0.001, rds:bclversus rds; p < 0.05,rds:bcl versus rds:113.