LeafBio, Inc. is the commercialization arm of Mapp Biopharmaceutical.

LeafBio focuses on pharmaceutical research and development of monoclonal antibody products for the treatment and prevention of viral and infectious diseases (including respiratory, gastrointestinal, and reproductive diseases), cancer, central nervous system and neurological diseases and disorders. LeafBio offers consulting services in the fields of biotechnology, pharmaceutical research and development, and laboratory testing and specializes in pharmaceutical research and development in relation to biodefense.