4 kinetic analyses of the dose-response relations for the amino acids in the presence or absence of picrotoxin or strychnine indicated that the number of molecules of amino acid combining with the receptor site in order to produce a response ( inhibition or excitation ) was 3 for gaba , 2 for glycine , 3 for taurine and 4 for beta-alanine .
C0002520
amino acid
C0001898
alanine