Recombinant protein is a protein encoded by a recombinant DNA that has been cloned in a system that supports expression of the gene and translation of mRNA. The host cells used for recombinant protein production can be bacteria, yeast, insect cell, and mammalian cell. We offer a comprehensive collection of recombinant proteins with excellent lot-to-lot consistency, superior activity and low endotoxin level. Our recombinant proteins include: cytokines, enzymes, growth factors, hormones, receptors, transcription factors, antibody fragments, etc. They are often essential for supporting cell growth, stimulating cell signaling pathways, triggering or inhibiting cell differentiation; and are useful tools for elucidating protein structure and function, understanding disease onset and progression, and validating pharmaceutical targets.