Abstract
The present report is a study of GO intragenic suppressors located in the A or E group of the b2 spore-color locus of Ascobolus immersus. The frame-shift nature of the suppressors was shown by 19 combinations of plus and minus suppressor mutations. The location of the mutation sites on the genetic map of group A was defined. The conversion pattern ofi the frameshift suppressors is discussed according to their plus or minus phase shift and their mutagenic origin.

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