PerSeptive Biosystems Inc. said on Tuesday that it has raised$6.75 million in an oversubscribed round of private venturefunding. The Cambridge, Mass., company had only hoped for $5million. Funding was provided by existing investors Bessemer,First Stage, Raytheon, 3i Ventures and Venrock Associates, andnew investors Highland Capital, Morgan Holland Ventures andPrince Ventures.

Including this round, PerSeptive has raised $12.25 million inventure funding since 1988.

PerSeptive develops and markets products for the purificationand analysis of biological molecules. The company currentlymarkets a Perfusion Chromatography system to analyzeproteins rapidly and a related Modular Surface Chemistriesproduct that coats the Perfusion media. PerSeptive isdeveloping a rapid antibody system to assay biomolecules.

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