KRT14 and invasive ductal breast carcinoma: We used K14‐Cre;Trp53F/F (KP) and K14‐Cre;Brca1F/F;Trp53F/F (KB1P) mice which normally develop single tumors in one mammary gland that histologically and transcriptionally resemble invasive ductal carcinoma in humans (Liu et al., 2007).