Abstract
A rapid and convenient method is described for resolving the polypeptide composition of Fraction 1 protein. Using crude leaf extracts of a number of Lycopersicon species, Fraction 1 protein was first separated by polyacrylamide gel electrophoresis and the gel slices containing the protein were isoelectrofocused in the presence of 8 m urea. Isoelectric focusing was also applied directly on subunits in gel slices obtained after sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The polypeptide composition produced is in agreement with previous determinations obtained by more elaborated techniques.
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