这个词是什么意思？
Drugs that are pharmacologically inactive but when exposed to ultraviolet radiation or sunlight are converted to their active metabolite to produce a beneficial reaction affecting the diseased tissue. These compounds can be administered topically or systemically and have been used therapeutically to treat psoriasis and various types of neoplasms.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D017319 · MeSH 2026。
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