Just over a month after emerging from stealth and disclosing a $150 million series A, Korsana Biosciences Inc. is making the leap to the public market via a merger with Cyclerion Therapeutics Inc.  The agreement, which is backed by a $370 million private placement from Korsana’s investors, solidly positions the newly merged company as it heads toward the clinic with KRSA-028, a next-generation shuttled antibody targeting amyloid beta for the treatment of Alzheimer’s disease, and builds out a pipeline of neurodegenerative disease candidates.