ARL13B and nasopharyngeal carcinoma: To investigate the effects of reduced PRPF31 expression on ciliogenesis in iPSC–derived RPE cells, RPE monolayers derived from the healthy control subject, the RP11 patient and NPC carrying the c.1205C>A variant, the RP11 patient carrying the c.267del variant and the RP11 patient carrying the exon 2–8 deletion were labeled with an antibody targeting the primary cilium marker ARL13B.