这个基因编码核糖核苷酸还原酶的两个不相同亚单位之一。这种还原酶催化核糖核苷酸形成脱氧核糖核苷酸。编码蛋白（m2）的合成以细胞周期依赖性方式调节。该基因的转录可以从替代启动子启动，这导致两种亚型的长度不同的N末端。在1号染色体和X号染色体上发现了相关的假基因。
This gene encodes one of two non-identical subunits for ribonucleotide reductase. This reductase catalyzes the formation of deoxyribonucleotides from ribonucleotides. Synthesis of the encoded protein (M2) is regulated in a cell-cycle dependent fashion. Transcription from this gene can initiate from alternative promoters, which results in two isoforms that differ in the lengths of their N-termini. Related pseudogenes have been identified on chromosomes 1 and X.
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