The rush to find new drugs to fight cancer is spurring big growth for a Madison company. Founded in 1998 as Tetrionics, the company was purchased in 2004 by a division of Sigma-Aldrich, of St. Louis. Its main product at the Madison building is still the vitamin D compound discovered by UW-Madison professor Hector DeLuca that forms the basis of Zemplar, by Abbott Laboratories.
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