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Biotechnology company ThermoGenesis Corp. said Thursday that it filed a shelf registration statement to sell up to $20 million in common stock and warrants.

The registration statement has not yet been declared effective by the Securities and Exchange Commission.

The company, based in Rancho Cordova, Calif., said it doesn't currently have plans to issue securities. The move was intended to provide flexibility in accessing capital markets if needed, ThermoGenesis said.

Shares of ThermoGenesis closed down 48 cents, or 13 percent, at $3.23.

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