In fact, MA39 binds to intact living human colon carcinoma LoVo cells (Figure 2A); in Western blot it recognizes a 200 kDa molecule of purified CEA antigen, and LoVo cellular extract (Figure 2B); it also stains human adenocarcinoma xenograft in mouse (Figure 2C). The gene discussed is CEACAM3; the disease is colon carcinoma.