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HMRa and MATa chromatin structure near the HO endonuclease recognition site at the Ya-Z1 border. Samples of the two loci were mapped with strains (HMRa only and MATa only) and primers that allow the specific detection of only one region. The chromosomal coordinates for the MAT locus are 93,633 bp less than the coordinates for the HMR locus. Extensive cleavage throughout the region of HMR occupied by nucleosome R3 was present at the active MAT locus.
