negative response : formalin , glutathione , acid hydrolyzed agar , protamine so4 , l-glutamic acid , lactose , glutamine , taurine , l-aspartic acid , putrescine 2 hcl , choline citrate , choline bitartrate , k citrate , and choline hcl . gamma-aminobutyric acid was negative or positive dependeng on concentration .
C0008408
choline bitartrate
C0008405
choline