PerSeptive Biosystems Inc. has filed for an initial publicoffering of 2.5 million shares of common stock priced between$11 and $13 per share.

The Cambridge, Mass., company develops, manufactures andmarkets products for the purification and analysis ofbiomolecules. PerSeptive markets a Perfusion Chromatographysystem to analyze proteins rapidly and a related ModularSurface Chemistries product that coats the Perfusion media.

The company has raised $11.4 million in venture funds since1988.

If the offering is completed, PerSeptive will have 8.4 millionshares outstanding. Underwriters Alex. Brown & Sons Inc. andCowen & Co. have a 15 percent overallotment option.

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