The function of RS1 (retinoschisin 1, ENSG00000102104) is as follows. Binds negatively charged membrane lipids, such as phosphatidylserine and phosphoinositides (By similarity). May play a role in cell-cell adhesion processes in the retina, via homomeric interaction between octamers present on the surface of two neighboring cells (PubMed:27114531). Required for normal structure and function of the retina (PubMed:19093009). {ECO:0000250|UniProtKB:Q9Z1L4, ECO:0000269|PubMed:19093009, ECO:0000305|PubMed:27114531}.