Shares of Regulus Therapeutics fell back near their already-reduced initial public offering level this week, suggesting that Wall Street may be less willing to embrace microRNA therapeutics than may have been anticipated.

By mid-morning Thursday, shares of Regulus were selling around $4.15, just $0.15 over the price at which they debuted to the public on Oct. 5.

To Byron Capital Markets analyst Doug Loe, the tepid response to Regulus' IPO is likely due to a combination of factors, most notably the early-stage nature of its product candidates.

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Dog DNA testing finds that some purebreds might not truly be purebreds, Inside Edition reports.

Mary Beckerle has returned as director of the Huntsman Cancer Institute, according to ScienceInsider.

Smithsonian Magazine reports that environmental DNA sampling can be used to track elusive organisms.

In Genome Research this week: repetitive satellite DNA in the fruit fly, transcriptome map assembly pipeline, and more.