a type II integral membrane protein on small intestinal and renal tubular epithelial cells, macrophages, granulocytes, and synaptic membranes from the CNS.

a transmembrane (type I) heparan sulfate proteoglycan, participating in cell proliferation, migration and cell-matrix interactions.

a proto-oncogene, mutations possibly leading to acute myelogenous leukemia (AML) and carrying an adverse prognosis.