This Week in PNAS

Afaf El-Sagheer and Tom Brown at the University of Southampton describe in this week's PNAS Early Edition a method for synthesizing chemically modified RNA constructs using click chemistry and solid-phase synthesis "to produce catalytically active hairpin ribozymes around 100 nucleotides in length." The authors suggest that "the ability to synthesize long RNA strands by a combination of solid-phase synthesis and click ligation is an important addition to RNA chemistry."

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Jay Shendure and his colleagues have developed a new method to more comprehensively identify human cell types, the NY Times reports.

Researchers in the UK and Japan have shown that infertility in mice with three sex chromosomes can be overcome, according to the Guardian.

China is embracing preimplantation genetic diagnosis, Nature News reports. 

In PLOS this week: host genetic factors associated with cervical neoplasia progression, population patterns for an ancient flowering rainforest plant, and more.