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Our prior studies identified co-expression of the human epidermal growth factor-like receptors 2 (ErbB2) and 3 (ErbB3), as well as the growth factor neuregulin-1 (NRG-1) in normal lung epithelium and lung cancers. As ErbB2 and ErbB3 dimerize to produce a high affinity receptor for NRG-1, we postulated that an autocrine growth loop was present in transformed and non-transformed pulmonary epithelial...