Acme Packet, TranS1 and ARYx Therapeutics lead small-cap percentage losers

Acme Packet Inc. (Nasdaq:APKT), TranS1 Inc. (Nasdaq:TSON) and ARYx Therapeutics Inc. (Nasdaq:ARYX) are among the biggest percentage losers in Thursday's trading among companies with market capitalizations under $1 billion.

Also included among the results: Pyramid Oil Company (AMEX:PDO), Gushan Environmental Energy Limited (NYSE:GU), Security Bank Corp. (Nasdaq:SBKC), ChemGenex Pharmaceuticals Limited (Nasdaq:CXSP), Volterra Semiconductor Corp. (Nasdaq:VLTR) and Fuel Systems Solutions Inc. (Nasdaq:FSYS).

Here are the biggest percentage losers among small caps:

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