A research professor has departed the University of under a cloud after five of his studies involving inflicting traumatic brain injuries on young pigs were retracted due to 'substantive questions' about the validity of their findings.
William M. Armstead 'is no longer a faculty member at Penn, has closed his lab and ended his animal research activities' the university told the in a statement on Tuesday.
It follows a mounting controversy and a reported federal investigation into Armstead's research, which involved drilling into the skulls of juvenile pigs and striking their brains with fluid-filled pistons to study their injuries and test various treatments.
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