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Proteins from sarcoplasmic reticulum vesicles solubilized by a nonionic detergent were fractionated by use of a reactive red-120 agarose column. The Ca-ATPase was obtained in pure form by eluting the column with 400 microM adenyl 5'-yl
polyacrylamide gel electrophoresis with continuous elution accord- ing to Hjerten et al. (14), which has certain advantages compared to other preparative polyacrylamide gel electrophoresis tech- niques (15). was used for purification of two
