LOH was examined for one polymorphic locus per each of 11 chromosomes (2,3, 5, 6, 7, 9, 11, 12, 13, 14, 15) in A, non-selected (i.e, non-mutant clones) (locus on chromosome 8 also examined); B, Aprt mutants exhibiting loss of chromosome 8; C, Aprt mutants exhibiting intragenic events; and D, Aprt mutants exhibiting mitotic recombination. For each clone, “Clone #” indicates mouse tag number, left or right kidney (LK or RK) and clone number. Red circle indicates loss of a DBA/2 locus and green circle indicates loss of C57BL/6 locus. Open circles indicate retention of heterozygosity.