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TALPHERA, INC. Merger & Acquisition 2020

Mar 25, 2020

Merger & Acquisition

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Filed by AcelRx Pharmaceuticals, Inc.

(Commission File No. 001-35068)

pursuant to Rule 425 under the Securities Act of 1933

and deemed filed pursuant to Rule 14a-12

under the Securities Exchange Act of 1934

Subject Company: Tetraphase Pharmaceutials, Inc.

(Commission File No. 001-35837