The authors went on to demonstrate that the RPE of Tyro3129/129 mice had about one-third the amount of TYRO3 protein of Tyro3B6/B6 mice, suggesting a model in which increased TYRO3 protein from the B6 allele suppressed retinal degeneration in all but the periphery of Mertktm1Gkm/tm1Gkm mice. This evidence concerns the gene TYRO3 and retinal degeneration.