 MENLO PARK, Calif.--BUSINESS WIRE--Revelation Biosciences Inc. Revelation, a clinical stage life sciences company focused on the development of immunologic-based therapies for the prevention and treatment of disease, announced today the closing of a private placement financing, raising gross proceeds of 4.4 million. National Securities Corporation, a wholly owned subsidiary of National Holdings, Inc. NASDAQ:NHLD acted as the exclusive placement agent and financial adviser for the success 