. "\"The inactivation of recombination at sequences around a mating type donor locus, with the consequence that the other donor is the only one available for mating type switching; exemplified by the HML locus and surrounding sequences on Chromosome III in Saccharomyces cerevisiae.\" [GOC:mah, PMID:9928492]" . . "inactivation of recombination (HML)" . . .