ExpreS2ion Biotech Holding AB is a Sweden-based biopharmaceutical company. The Company specializes in developing cell lines and processes based on a non-viral Drosophila S2 cells expression system. The Company's ExpreS2 recombinant protein expression platform supports all phases of drug discovery, research and development and manufacturing. ExpreS2 is a non-viral insect cell expression system that establishes stable polyclonal pools that provide high-protein expression levels without selection pressure. The system is designed for transient or stable transfections using vector deoxyribonucleic acid containing a hybrid promoter. It also ensures high cell density without aggregation or toxic metabolite build-up issues. Through the joint venture AdaptVac ApS, the Company applies a Plug-and-Play Virus Like Particle technology for development of therapeutic and prophylactic vaccines within oncology, infectious diseases and immunological disorders.