这个词是什么意思？
Dimers found in DNA chains damaged by ULTRAVIOLET RAYS. They consist of two adjacent PYRIMIDINE NUCLEOTIDES, usually THYMINE nucleotides, in which the pyrimidine residues are covalently joined by a cyclobutane ring. These dimers block DNA REPLICATION.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D011740 · MeSH 2026。
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