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Abstract
SUMMARY: cDNA clones representing eight mRNAs expressed abundantly in the dikaryon of Schizophyllum commune at the time of fruiting, but very low in the progenitor monokaryons, were used to estimate the concentrations of these mRNAs in cultures of the dikaryon and monokaryon growing under conditions that suppress the formation of fruit-bodies. Such conditions as high atmospheric carbon dioxide and continuous darkness in surface cultures or growth in suspension cultures generally lower the concentrations of these mRNAs in the dikaryon but do not bring them down to the very low levels of these mRNAs in the monokaryons. Therefore the expression of these mRNAs, which depends on the dikaryotic condition, may be required but is not sufficient for the occurrence of fruiting.
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