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SDS-PAGE of a purified preparation of the ATPase enzyme. Electrophoresis was performed as described previously (14), using 12.6% polyacrylamide gels. Molecular weight standards were phosphorylase b (Mr = 94,000), bovine serum albumin (Mr = 67,000), ovalbumin (Mr = 43,000), carbonic anhydrase (Mr = 30,000), and soybean trypsin inhibitor (Mr = 20,100).
