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BCK4 cells are tumorigenic; estrogen causes a histologic switch. Images of whole tumors, grown in placebo (left MBCPure) or estrogen (E2, right MBCMixed) supplemented mice, stained with mucicarmine. Arrow denotes invasive breast carcinoma (IBC) component and arrowheads mucinous regions (MUC). Red arrow denotes stroma bisecting the IBC and MUC regions of the MBCMixed tumor
