When both tumor types were co-clustered with a reference library of 122 tumor samples, arising in various mouse breast tumor models [30], samples designated as KRT5+ clustered together with other basaloid tumor models (Fig. 2A–C), and those designated as KRT5- clustered together with luminal models, such as transgenic MMTV-neu-induced tumors (Fig. 2A and Fig. S2). Here, ERBB2 is linked to breast neoplasm.