**Figure 4. **SDS–PAGE analysis of five
proteinase preparations purified from five separate α-crystallin
fractions. The purification was performed by the three-step procedure
described in Methods. Lanes 1-5 show five different purified proteinase
preparations from five separate α-crystallin fractions. Note that all
five preparations reproducibly showed three bands that are identified
as 1, 2, and 3.