For example, in Astyanax mexicanus, albinism and depigmentation in cavefish are linked to oculocutaneous albinism type 2 (oca2) and melanocortin receptor 1 (mc1r), respectively (Protas et al. 2006; Gross et al. 2009; Stahl and Gross 2015; Klaassen et al. 2018). The gene discussed is OCA2; the disease is albinism.