PHENOTYPE: Len1 encodes a 22kDa major lens protein of the gamma-crystallin class, synthesized from embryonic day 14 to postnatal week 4. Variation is seen by isolelectric focusing: the a allele in DBA/2; b allele in BALB/c, C57BL/6, C57BL/10 and SEC/1; c allele in M.m. molossinus and M.m. castaneus. [provided by MGI curators]