A team of Brazilian researchers this month reported for the first time on the discovery of long-term persistence and parental transmission of RNAi in Rhodnius prolixus, a species of bloodfeeding bugs called triatomines.

As vectors of Trypanosoma cruzi, a parasite that causes trypanosomosis, triatomines are a medically important insect. R. prolixus is also a classical model in insect biology, and a number of recent studies have demonstrated that RNAi occurs in the bugs.

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In PNAS this week: genomic study of group B Streptococcus evolution, selection on the X chromosome in great apes, and more.

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