Two mutants of were labelled with [S]methionine either at the time of resuspension in sporulation medium or 1, 2 or 3 h later, and radioactive proteins were detected after cell extracts had been subjected to two-dimensional gel electrophoresis. The mutants completed almost all of the changes in protein synthesis that occur in the wild-type in these conditions. A heavily labelled protein was found in the mutants that has also been observed in a mutant but does not occur in the wild-type.


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