12-o-tetradecanoylphorbol-13-acetate ( tpa ) stimulates the release of free choline from intact ng108-15 cells into the medium , without affecting the release of phosphocholine ( liscovitch , m. , blusztajn , j.k. , freese , a. , and wurtman , r.j. ( 1987 ) biochem . j . 241 , 81-86 ) .
C0008405
choline
C0031716
phosphocholine