And while modern drug research labs can speed up and systematize many steps, "there's still a very large element of mystery in the discovery process, " says John Swen, vice president for science policy and public affairs for the pharmaceutical giant Pfizer.

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And while modern drug research labs can speed up and systematize many steps, "there's still a very large element of mystery in the discovery process, " says John Swen, vice president for science policy and public affairs for the pharmaceutical giant Pfizer (nyse: PFE - news - people ).

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How the next two installments in the trilogy are going to deal with the two and the three-way love triangle that lies ahead without this animating element is a mystery.

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