Two independent research groups this month published data indicating that plant microRNAs are not taken up into animals when ingested in concentrations sufficient to regulate gene expression, contrary to a highly publicized report from last year.

While additional work in larger animal populations is required to bear out the latest findings, they suggest that some technical artifact or contamination issue may have been behind the original study, according to Kenneth Witwer, a Johns Hopkins School of Medicine researcher and lead author of one of the new papers.

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In Science this week: the Human Silencing Hub protein complex, and more.

Heads of various research funding agencies discuss how to encourage scientific breakthroughs, ScienceInsider reports.

The Kansas City Star examines issues surrounding newborn genome sequencing.

Researchers say their Research Resource Identifier citation format is catching on, Nature News reports.