Fig. 1. The μ-opioid receptor (MOR) is overexpressed in several human non-small cell lung cancer cell lines. Immunoblot analysis using anti-MOR (A ) and anti-actin (B ) antibodies of cell lysates from human adenosquamous carcinoma (A549), adenocarcinoma (SKLU-1, H1703, H1993, H522, H1437, H1838, H1975), bronchioloalveolar carcinoma (H358, SW1573), large cell carcinoma (H661), squamous cell carcinoma (H226, H2170), and noncancerous BEAS-2B cells.