The two-chromosome LOH reporter strain UCC8918 was generated by mating UCC8917 x UCC5181. UCC8917 was derived from UCC5179 by one-step integration of a PCR fragment carrying ADE2 into an intergenic region of chromosome IV (coordinates 1,515,634–1,515,738), which was generated using oligos MarthaN/H2L and MarthaN/H2R with pRS402 [63] as a template.