Transport-mediated clearance of various radioactively labeled compounds in human astrocytoma cell cultures. (A) [3H]arachidonamide (12, ○), [3H]2-arachidonylglycerol (18, squares), [3H]N-(4-hydroxyphenyl)-arachidonamide (22, ◊). (B) [3H]anandamide (1, squares), [3H]cis-eicosatrienoylethanolamide (2, ○), [3H]cis-eicosadienoylethanolamide (3, ▵), [3H]cis-eicosaenoylethanolamide (4, ■, and [3H]oleylethanolamide (6, ●). Results are expressed as mean ± SEM (n = 3–6).