OCA2 and oculocutaneous albinism: Next, to determine the genetic causes of OCA segregating in these nine families, Sanger sequencing of coding and non-coding exons of all six known OCA genes (TYR (OCA1), OCA2(OCA2), TYRP1 (OCA3), SLC45A2 (OCA4), SLC24A5 (OCA6) and C10ORF11 (OCA7)) was performed for the proband of each family.