“The data show that: (1) taurine, in the presence of 10-6 M epinephrine or 1.25 x 10-6 M digoxin, promotes cellular … procaine amide increase the conversion of taunine to isethionic acid by heart slices, quinidine has no effect, while acetylcholine depresses the conversion; (3) taurine, … epinephrine.”