sr-Cat Polypeptide-2 is a single chain recombinant protein produced by fermentation in E. coli. The starting gene is synthesized to be identical to the gene which codes for Vascular Endothelial Growth Factor derived from cat. The parent protein contains a maximum of 189 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.