Fusion Antibodies plc is a United Kingdom-based collaborative research organization (CRO) company. The principal activity of the Company is the research, development, and manufacture of recombinant proteins and antibodies, particularly in the areas of cancer and infectious diseases. It is engaged in providing an integrated end-to-end range of antibody engineering services for the development of antibodies for both therapeutic drug and diagnostic applications. It offers a range of services in antibody generation, development, characterization, optimization, and small-scale production. These services include antigen expression, purification and sequencing, antibody humanization using its proprietary CDRx platform and cell line development, producing antibody generating stable cell lines optimized for use downstream by the customer to produce material for clinical trials. It is also developing OptiMAL, a mammalian antibody library and discovery platform yielding fully human antibodies.