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MORAb-004 is a IgG1 antibody that recognizes a cell surface protein, endosialin, also called Tumor Endothelial Marker-1 (TEM1) and CD248, which is expressed on a tumor associated pericytes and other tumor stromal cells. Pericytes are specialized cells that support the formation of blood vessels that support blood to tumors for their growth and survival. Expression of endosialin in tumors has been observed by several independent studies and experiments that block endosialin function have shown the ability to inhibit tumor growth and metastasis.