| http://www.w3.org/ns/prov#value | - The purpose of the therapeutic gene is to inhibit the growth of or kill the cancer cell or produce cytokines or other cytotoxic agents which directly or indirectly inhibit the growth of or kill the cancer cells. [0256] Suitable prodrug enzymes include thymidine kinase (TK), xanthine-guanine phosphoribosyltransferase (GPT) gene from E. Coli or E. Coli cytosine deaminase (CD), or hypoxanthine phosph
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