The genes encoding the rRNA components of the ribosome are organized as tandem rDNA repeating units, designated RNR1 through RNR5, in the p12 region of chromosomes 13, 14, 15, 21 and 22. Each rDNA unit encodes a 45S rRNA which serves as the precursor for an 18S, 5.8S and 28S rRNA. The number of rDNA repeating units varies between individuals and from chromosome to chromosome, although usually 30 to 40 repeats are found on each chromosome. This ribosomal repeating unit located on chromosome 22 is not currently annotated on the reference genome. [provided by RefSeq, Mar 2009]

[中文简述(自动翻译):]  编码核糖体rRNA的组分的基因被组织为串联的rDNA重复单元，通过RNR5指定RNR1，在染色体13，14，15，21和22的P12区域中的每个的rDNA单元编码45S rRNA的哪作为前体的18S，5.8S和28S rRNA基因。的rDNA的重复单元的数目的个体之间，并从染色体染色体而异，但通常为30?40重复各自染色体上找到。位于22号染色体上该核糖体重复单元当前未注释的参照基因组。 [由RefSeq的，2009年03月提供]

RNR5基因在不同组织中的表达：    [UniProt]

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