The __Proceedings of the National Academy of Sciences__ has halted the print publication of a controversial scientific paper, saying it's investigating the conditions under which it was ushered through peer review by a distinguished academy member who advocated for its inclusion in the journal. The linkurl:paper;, written by University of Liverpool researcher linkurl:Donald Williamson,; posited that butterflies are the evolutionary result of a long-ago mating between worm-like and winged ancestors. It appeared in the early edition on __PNAS__'s website on August 28th and was to appear in the print version of the journal soon. But according to the linkurl:__Times Higher Education__,; __PNAS__ has decided to hold up on printing the study after a flood of negative reactions from biologists about the paper and the journal's practice of allowing academy members to "communicate" manuscripts as a way to speed their publication. __PNAS__ linkurl:announced; last month that it would be doing away...

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