IRBP shuttles 11-cis and all trans retinoids between the retinol isomerase in the pigment epithelium and the visual pigments in the photoreceptor cells of the retina.
Secreted, extracellular space, extracellular matrix, interphotoreceptor matrix. Interphotoreceptor matrix that permeates the space between the retina and the contiguous layer of pigment epithelium cells.