Merck & Co. Inc. is adding to its hematology assets in the takeover of Imago Biosciences Inc. for $36 per share, an arrangement with an equity value of about $1.35 billion. Shares of Imago (NASDAQ:IMGO) took flight as Wall Street learned of the deal, ending the day at $35.59, up $18.19, or 104%. Imago is working on new drugs for myeloproliferative neoplasms and other bone marrow diseases. Lead candidate bomedemstat (IMG-7289), an orally available inhibitor of the epigenetic enzyme lysine-specific demethylase 1 (LSD1), is undergoing phase II trials for the treatment of essential thrombocythemia, myelofibrosis and polycythemia vera, along with other indications.