Ares Life Sciences, a healthcare-focused investment group, has signed a definitive agreement to acquire Planet Biopharmaceuticals, Inc., including its wholly owned subsidiary Antigen Laboratories, Inc., a producer of allergen extracts in the U.S. Financial terms were not disclosed. Ares also recently signed an agreement to acquire Greer Laboratories, Inc., another provider in the U.S. allergy immunotherapy (AIT) market. The acquisition of Antigen expands Ares’ strategic focus on the U.S. A...