Biotin Linear PEGs from JenKem Technology are convenient PEG reagents for PEGylation of avidin or streptavidin containing products. Biotinylated PEGylation products with molecular weights, branching, and functional groups not listed in our online catalog may be available by custom synthesis. Please inquire at firstname.lastname@example.org about pricing and availability of custom PEGylation products. Bulk PEGs and GMP PEGs are also available upon request. Please contact us for special bulk pricing.