RegRNA is an integrated web server for identifying the homologs of Regulatory RNA motifs and elements against an input mRNA sequence. Both sequence homologs or structural homologs of regulatory RNA motifs can be identified. The regulatory RNA motifs supported in RegRNA are categorized into several classes:

• Motifs in mRNA 5'-UTR and 3'-UTR.
• Motifs involved in mRNA splicing.
• Motifs involved in transcriptional regulation.
• Other motifs in mRNA, such as riboswitches.
• Prediction of the splice sites, such as splicing donor/acceptor sites.
• RNA structural features, such as inverted repeat.
• miRNA target sites.