Protalix BioTherapeutics, Inc. is a biopharmaceutical company focused on the development and commercialization of recombinant therapeutic proteins based on its ProCellEx protein expression system, ProCellEx. Using its ProCellEx system, the Company is developing a pipeline of biosimilar or generic versions of recombinant therapeutic proteins based on its plant cell-based expression technology, which focuses pharmaceutical markets and that rely upon known biological mechanisms of action. ProCellEx protein expression system consists of a set of technologies and capabilities for the development of recombinant proteins, including advanced genetic engineering technology and plant cell-based protein expression methods. Its ProCellEx protein expression system is built on flexible custom-designed bioreactors made of polyethylene and optimized for the development of complex proteins in plant cell cultures. In June 2010, it had completed the preliminary phase I clinical trial of PRX-105.