SFKs regulate phosphorylation of EGFR, ErbB2, and ErbB3. A: Western analysis of ErbB family members in NSCLC cell lines treated with PP1. Actin was used as a loading control. B: Western blotting of HCC827 cells stably transfected with Src shRNA vectors (A, C, or D), empty vector (vector), or nothing (HCC827).