NEW BRUNSWICK, N.J.--(BUSINESS WIRE)--Johnson & Johnson (NYSE: JNJ) announced today it has entered into a definitive agreement to acquire Ambrx Biopharma, Inc., or Ambrx (NASDAQ: AMAM), a clinical-stage biopharmaceutical company with a proprietary synthetic biology technology platform to design and develop next-generation antibody drug conjugates (ADCs), in an all-cash merger transaction for a total equity value of approximately $2.0 billion, or$1.9 billion net of estimated cash acquired. Ambrx is advancin ...