ERBB2 and Infertility: To address the effect of conditional Erbb2 knockout on the infertility phenotype of Mig-6d/d mice, we mated female control, Mig-6d/d, and Mig-6d/dErbb2d/d (Pgrcre/+Mig-6f/fErbb2f/f) mice with wild type male mice for 6 months to determine their overall fertility.