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Uptake and processing of a carboxy-terminally truncated SQD1 preprotein of A. thaliana by isolated pea chloroplasts. Lane 1, translation product; lane 2, translation product incubated in the presence of pea chloroplasts; lane 3, translation product incubated in the presence of pea chloroplasts and thermolysin. Proteins were labeled with [35S]methionine and visualized by autoradiography after SDS/PAGE. The approximate molecular mass (kDa) of the proteins is indicated.
