The BCW Index closed up .37 percent for the five-day trading period ended Tuesday. Leading gainers for the week were Qiagen, PerkinElmer, and Molecular Devices, which all rose more than 5 percent for the week. Invitrogen led decliners with a 5.4 percent drop.

In comparison, the Dow Jones Industrial Average fell .1 percent, the Nasdaq climbed 1.1 percent, and the Nasdaq Biotech Index closed up 2.2 percent.

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The partially reinstated US travel ban leaves space for uncertainty for researchers, Nature News says.

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