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HER3+ − erbB-3 expression levels ≥ canine mammary epithelial cells (CMEC). EGFr+/HER2+/HER3+/HER4+ − EGFr, erbB-2/HER2, erbB-3, and erbB-4 expression levels ≥ CMEC. *Basic human breast cancer phenotypes plus reference to overexpression of genes encoding EGFr/c-erbB-1 (2 CMT lines), c-erbB-3/HER3 (3 CMT lines), and c-erbB-4/HER4 (1 CMT line).
