The variants were MITF wildtype containing mouse MITF-m (419 aa), MITF spotted which is a mutant of MITF lacking the alternatively spliced exon 6A and MITF spotless an intragenic suppressor mutation of MITF spotted that in addition to MITF spotted contains a premature stop codon (K316S top).
MITF afbrigðin voru MITF wildtype (MITF-m isoformið, 419 aa), MITF spotted sem skortir 18 bp röð vegna splæsingar og MITF spotless sem auk þess að vanta 18 bp röðina ber stökkbreytinguna K316S top.