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Expression of ErbB receptors in EGFR knock-out mice. Whole fetal lung (A) or type II epithelial cells (B) were isolated on E-17 of gestation from wild-type (WT) and knock-out (KO) mice and processed by Western blot to detect protein abundance of ErbB family of receptors. Samples were normalized to GAPDH to control for protein loading. Data in the right panels are from three independent experiments. *, p < 0.02 versus WT; **, p < 0.05 versus WT.
