NEW YORK (GenomeWeb News) – Investment bank ISI Group this week downgraded shares of PerkinElmer and upgraded shares of Danaher.

In a research note, analyst Ross Muken lowered the rating for PerkinElmer to Neutral from Buy, saying that the company's stock is "now approaching the upper end of its historical range, and therefore we see limited opportunity for multiple expansion." He maintained a $49 price target on PerkinElmer's shares.

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