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SDS–PAGE analysis of purified native SSB protein, purified recombinant SSB protein, and recombinant SSB truncated by limited trypsin digestion. Lane 1, markers; lane 2, SSB purified from S.solfataricus; lane 3, recombinant Sulfolobus SSB purified from E.coli; lane 4, recombinant SSB after trypsin digestion.
