Profile: Arvys Proteins Inc. specializes in providing contract research services for protein biochemistry. We specialize in protein expression, purification and characterization. We offer a number of expression systems designed to meet specific goals, ranging from expression of tagged proteins for discovery research to production of bio-pharmaceuticals for preclinical development. Protein production yields are optimized by selection of an appropriate expression system, generation of a high-producing expression construct, optimization of fermentation/cell culture conditions and purification process. High level of protein expression is critical for efficient and economical purification of active recombinant proteins. We can optimize expression by engineering an expression vector with a strong promoter, an efficient ribosome binding site, a high copy number and combining it with an appropriate host. SDS-PAGE and/or dot/Western blotting are routinely used for fraction analysis.