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Fig. 1. The structure of human pri-miRNAs. (A) Two examples of miRNAs with their own transcription units, such as miR-21 and the polycistronic miR-17–92-1 cluster (Cai et al., 2004; He et al., 2005). (B) miRNAs that are transcribed with other genes. miR-15a~16-1 resides in the intron of a non-coding RNA (ncRNA) (Calin et al., 2004) and miR-106b~93~25 lies in the intron of a protein-coding RNA (Rodriguez et al., 2004). miR-155 is found in the exon of a ncRNA (Eis et al., 2005), whereas miR-198 is in the exon of a protein-coding mRNA (Cullen, 2004). DLEU2, deleted in lymphocytic leukemia 2; MCM7, minichromosome maintenance deficient 7; BIC, B-cell integration cluster; FSTL1, follistatin-like 1.





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