(A) Mouse eyes at embryonic day (E)14.5 were isolated, and the retina and retinal pigment epithelium combined tissue (termed retina) was micro-dissected. The whole body (WB) with eye tissue removed was processed similarly and used as reference for differential protein expression analysis. Retina and WB samples (n = 5 for each sample type, 55 μg protein per sample) were subjected to high-throughput tandem mass spectrometry (MS/MS). (B) The workflow for differential protein expression analysis is outlined. The edgeR pipeline was used to determine differential protein expression using normalized spectral counts. Proteins passing stringency criteria of ≥2.5 average spectral counts, ≥2.0 fold-change (in retina, compared to WB), False Discovery Rate <0.01 were considered to have enriched expression in the retina.