Madison-based Cellular Dynamics International has raised $40.6 million, according to a filing the company made with the Securities and Exchange Commission. The privately held company, known as CDI, sells stem cell-derived heart cells to Swiss pharmaceutical company Roche and others to help them test the toxicity of drugs. CDI was founded by stem cell pioneer James Thomson and several other University of Wisconsin-Madison researchers, along with some people previously associated with NimbleGen Systems LLC.
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