Arena Pharmaceuticals, Inc. (Nasdaq: ARNA) announced Merck and Co., Inc.'s decision (through an affiliate) to discontinue development of MK-1903, an investigational niacin receptor agonist to treat atherosclerosis being developed under its research collaboration with Arena. Merck also informed Arena that the company will not continue the collaboration. Merck made the decision to discontinue development of MK-1903 following evaluation of the results of a recently completed Phase 2a clinical trial... 
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