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more general categories information about this item C04. Neoplasms C04. Neoplasms Neoplasms [MESH:D009369] (10293) Neoplasms by Site [MESH:D009371] (9169) Digestive System Neoplasms [MESH:D004067] (7487) Gastrointestinal Neoplasms [MESH:D005770] (6452) C06. Digestive System Diseases C06. Digestive System Diseases Digestive System Diseases [MESH:D004066] (9461) Digestive System Neoplasms [MESH:D004067] (7493) Gastrointestinal Neoplasms [MESH:D005770] (6460) Gastrointestinal Diseases [MESH:D005767] (7443) Gastrointestinal Neoplasms [MESH:D005770] (6460) D03. Heterocyclic Compounds D03. Heterocyclic Compounds Heterocyclic Compounds [MESH:D006571] (56330) Alkaloids [MESH:D000470] (5036) Solanaceous Alkaloids [MESH:D012991] (181) Nicotine [MESH:D009538] (47) Heterocyclic Compounds, 1-Ring [MESH:D006573] (30631) Pyridines [MESH:D011725] (4775) Nicotine [MESH:D009538] (47) Heterocyclic Oxides [MESH:D006577] (510) Cyclic N-Oxides [MESH:D003497] (414)