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plural nucleins
(biochemistry) A phosphorus-rich protein found in the nucleus of a cell, later specifically nucleohistone or nucleoprotamine; also, any similar compound present in the cell nucleus. quotations examples
While delving microscopically through the pus in surgical bandages, Miescher found a substance he didn't recognize and called it nuclein (because it resided in the nuclei of cells).
2003, Bill Bryson, A Short History of Nearly Everything, BCA, published 2003, page 354