Both mouse strains were found to be express the Pde6b retinal degeneration mutation, Pde6brd1 in addition to the targeting of Sftpa1tm1Kor/J and Sftpd. Our goal is to report the previously unrecognized Pde6brd1 genotype and phenotype in Sftpa1tm1Kor/J and Sftpd-/- mice. The gene discussed is SFTPD; the disease is retinal degeneration.