GRM6 and breast cancer: To specifically eliminate GABAA receptors from ON BCs we used a Gabrg2 (GABAA receptor, subunit gamma 2) floxed mutant mice (Schweizer et al., 2003) crossed to an ON BC specific Cre line (Grm6-Cre) and a fluorescent reporter line (Ai9/tdTomato) (Hoon et al., 2015).