This deletion, induced by X-irradiation of a (C3H/HeH x101/H)F1 female mouse, encompasses 12.66 Mb representing approximately 20% of mouse Chr 13 including bands A3.1 through A4. The deleted segment shares synteny with regions of human 6p25 and 6p22 associated with 6p deletion syndromes and 6p associated disorders. (J:94183, J:101156)