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RNA recognition motif 1 (RRM1) found in vertebrate probable RNA-binding protein 23 (RBM23) This subgroup corresponds to the RRM1 of RBM23, also termed RNA-binding region-containing protein 4, or splicing factor SF2, which may function as a pre-mRNA splicing factor. It shows high sequence homology to RNA-binding protein 39 (RBM39 or HCC1), a nuclear autoantigen that contains an N-terminal arginine/serine rich (RS) motif and three RNA recognition motifs (RRMs), also termed RBDs (RNA binding domains) or RNPs (ribonucleoprotein domains). In contrast to RBM39, RBM23 contains only two RRMs.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",