1.4.3.2 L-amino-acid oxidase histiocyte variable percentage of positive staining in several tissues, solid tumors, interfollicular areas, sinuses of reactive lymph nodes, red pulp of lymphoid follicles, thymus medulla, all lymphoma subtypes, particularly high enzyme expression in classical Hodgkin lymphoma and nodular lymphocyte predominant Hodgkin lymphoma cells 699933 5.3.99.2 Prostaglandin-D synthase histiocyte glutathione-requiring enzyme 3121