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Certain mycelia of the ascomycete Nectria haematococca show two morphological differentiated states, rings and sectors, which are cytoplasmically transmissible. Two nuclear loci A and S, appear to be involved in the control of these differentiated states. Mutations in the A region either prevent ring formation and the synthesis of the corresponding infectious factor (type a) or modify ring expression (type 58). Using forced heterokaryons, it was demonstrated that locus A corresponds to a single gene which exists in three allelic forms, wild-type, a and 58.
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