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Abstract
White and red mutants of Phycomyces, derived from two independent wild types (yellow) by mutagenesis using nitrosoguanidine, either in a single step (26 white, 5 red mutants), or in two steps (10 white mutants, from one of the red mutants) were studied with respect to complementation in heterokaryons. The tests clearly establish the involvement of three and only three genes, here named carA, carB, and carB. The carA and the carR mutants are white, the carA mutants do not accumulate phytoene, the carB mutants do. The carR mutants are red and accumulate lycopene. The two step mutants are either carA and carR, or carB and carR double mutants. A few of the white mutants obtained in a single mutagenization step are affected in carA and carR. They may be polar mutants in an operon or accidental double mutants.
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