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" ... The researchers found that in adult dragons, JARID2 and JMJD3 were expressed more highly in ZZf tissues than in either ZWf of ZZm tissues. Not only were these two genes over-expressed, but the researchers were surprised to discover that JARID2 and JMJD3 produced a unique alternative transcript in sex-reversed ZZf dragons -- a transcript that is not seen in the tissues of normal ZWf and ZZm dragons. Each gene's alternative RNA transcript retained one intron. Introns are stretches of DNA that guide gene expression patterns instead of encoding proteins, and these regions are spliced out (or edited out), of the mature RNA message. These non-coding stretches were long known as "junk DNA" because, until recently, we didn't understand their essential roles in gene expression. ... "