Under the direction of Professor Roberts, CoEBio3, UK, we owns a proprietary technology for making polyamino acids of unique quality, economically in commercial scale. epsilon-polylysine (base form, mw 3-7k, 99.5%), 505USD/100g gamma-poly-L-glutamic acid( COOH form, 20-40k, 99.5%), 151USD/20g They are synthetic, non-cytotoxic and water-soluble.