EGF and non-small cell lung carcinoma: Figure 2-A demonstrates that EGF induces a complex formation between the EGFR and MOR which peaks at 5 to 15 minutes after EFG challenge. Based on our results that a MOR/EGFR complex can occur with EGF stimulation of H358 cells, we next examined whether MOR can regulate EGFR phosphorylation. Utilizing a panel of anti-phospho-EGFR antibodies, Figure 2-B demonstrates that pretreatment of H358 human NSCLC cells with the peripheral MOR antagonist MNTX failed to attenuate EGF-induced EGFR tyrosine phosphorylation.