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-X     MTSEA Biotincap; 2-((6-((biotinoyl)amino)hexanoyl)amino)ethylmethanethiosulfonate  White solid soluble in DMF or DMSO   Store desiccated at -20°C  C19H34N4O5S3   MW: 494.68