the incubation of blood smears taken from cattle , sheep , goats horses , and pigs in the presence of urea , metal salts ( zinc , magnesium , manganese , calcium ) or amino acids ( phenilalanine , alanine , glycine , histidine , methionine , cystine cysteine ) at various concentrations revealed that the cytochemical activity of the alkaline phosphatase shows changes that depended on the animal species .
C0002520
amino acids
C0017890
glycine