RP9 and congenital stationary night blindness: Similarly, for patient P27 (congenital stationary night blindness; TRNT1; rank 12), the phenotypic similarity of the patient with OMIM:616959 (Retinitis pigmentosa and erythrocytic microcytosis) was modest (0.476), and the best phenotypic similarity, still moderate (0.500), was found with the phenotypic annotation of the neighboring RP9 gene (associated with Retinitis pigmentosa 9) in the TRNT1 interactome.