text:  Ets2 null fibroblasts with the ErbB oncogene present in epithelial cells Fibroblasts isolated from mammary gland with Ets2 deletion in fibroblasts and the ErbB2 oncogene present in epithelial cells strain: FVB/N; age: 16 Weeks; tissue: Mammary Gland; cell type: Fibroblasts; genotype: ErbB2;Fsp-cre;Ets2db/loxP