(BUSINESS WIRE)--Ironwood Pharmaceuticals, Inc. (NASDAQ: IRWD) and Protagonist Therapeutics, Inc. today announced that they have entered into a collaboration to discover novel peptides for potential development by Ironwood. The collaboration capitalizes on Protagonist’s proprietary disulfide rich peptide (DRP) technology platform, and provides Ironwood with the opportunity to develop novel peptides and treatments against clinically-validated targets in therapeutic areas with significant unmet medical needs.