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| Target Organ |
| | The site of action of a toxin. Most toxins are specific in their toxicity and damage only particular tissues or organs. |
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| Tetrodotoxin |
| | A potent neurotoxin produced in some species of frogs, puffer fish and other invertebrates. |
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| Tissue |
| | A group of cells with similar structure and function. There are four types of tissues: epithelial tissue, connective tissue, muscle tissue, and nerve tissue. |
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| Tumor |
| | A general term for an uncontrolled growth of cells that becomes progressively worse with time. Tumors may be benign or malignant. Same as neoplasm. |
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| Tumor Suppressor Gene |
| | Genes present in normal cells that serve to prevent a cell with damaged DNA from proliferating and evolving into an uncontrolled growth. Sometimes referred to as anti-oncogenes. The p53 gene is a tumor suppressor gene. |
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