MTSEA biotin selectively labels thiols under mild conditions. We offer MTSEA biotin with different linker lengths (Biotin-MTSEA, Biotin-X-MTSEA, and Biotin-XX-MTSEA), all of which allow selective labeling of cell surface thiols. Longer linkers should facilitate interaction between biotin and streptavidin.   MTSEA biotin   2-((Biotinoyl)amino)ethylmethanethiosulfonate  White solid soluble in DMF or DMSO  Store desiccated at -20°C   C13H23N3O4S3  MW: 381.52