the lowest behavioral thresholds for the most effective feeding stimuli were 3 x 10 ( -11 ) mol/l for both enantiomers of lactic acid , 10 ( -8 ) mol/l for l-proline and both enantiomers of cysteine and 10 ( -7 ) mol/l for acetylcholine iodide and some of the effective neutral amino acids .
C0010654
cysteine
C0301715
neutral amino acids