Adenosine receptors presence in SK-N-MC cells. (A) Adenosine receptors A1, A2A, and A2B were specifically detected by Western-blotting, as stated in the Methods section, in plasma membranes from human brain (HB), C6 glioma cells (C6), and SK-N-MC cells (SK-N-MC). (B) Representative image showing A2A receptors in intact cells by immunocytochemistry. (C) Relative expression levels of A2A and A2B receptors in SK-N-MC cells.