3.1.3.19 glycerol 2-phosphate + H2O - 3.1.3.19 additional information the presence of lysosomal enzymes like trimetaphosphatase observed in mononuclear phagocytes in the circulating blood indicating that these cells are able to participate in the phagocytic process gathering many phagocytic cells and forming multinucleated giant cells, possibly having a role in the blood clearance process