Vitamins are organic chemicals required by the body in trace amounts but which cannot be synthesized by the body. The vitamins required for growth and maintenance of health differ between species; compounds regarded as vitamins for one species may be synthesized at adequate rates by other species. For example, only primates and the guinea-pig require ascorbic acid (vitamin C; section 6.4) from their diet; other species possess the enzyme gluconolactone oxidase which is necessary for the synthesis of vitamin C from D-glucose or D-galactose
一、基因治疗的策略 The Strategy of Gene Therapy 二、基因转移技术 The Technique of Gene Transfer 三、基因干预 Gene Interference 四、治疗基因的受控表达 Regulated Expression of Therapeutic Gene 五、基因治疗的应用研究 The Application of Gene Therapy