Crystallins are the dominant structural components of the vertebrate eye lens. Detected in the superior olivary complex of the auditory hindbrain. In the embryo, expressed by day 12 of gestation. Maximum levels are found at day 30-40 followed by a rapid decline. Has a two-domain beta-structure, folded into four very similar Greek key motifs. There are six different gamma crystallins identified in mouse lens. Belongs to the beta/gamma-crystallin family.