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Immunological properties of rat lens gamma-crystallins. II. Characterization of low molecular weight components.

Two low molecular weight proteins with isoelectric points above pH 8 occur in the water-soluble proteins of the 24-day-old rat lens. Their molecular weights, estimated by SDS gel electrophoresis, are 9,500 and 10,500 daltons. The 9,500-dalton protein cross-reacts with gamma 1-crystallin. The 10,500-dalton protein designated gamma 3-crystallin is nonidentical with gamma 1 and gamma 2-crystallins and shows no cross-reactivity with alpha- and beta-crystallins.