ReadiLink™ xtra rapid antibody labeling kits require essentially only 2 simple mixing steps without a column purification needed. Preactivated iFluor® 488 used in this ReadiLink™ kit is quite stable and shows good reactivity and selectivity with antibodies. The kit has all the essential components for labeling ~2x50 ug antibody. Each of the two vials of preactivated iFluor® 488 dye provided in the kit is optimized for labeling ~50 µg antibody. ReadiLink™ xtra iFluor® 488 rapid antibody labeling kit provides a convenient and robust method to label monoclonal and polyclonal antibodies with the bright green fluorescent iFluor® 488 fluorophore. AAT Bioquest's iFluor® dyes are optimized for labeling proteins, in particular, antibodies. These dyes are bright, photostable and have minimal quenching on proteins. They can be well excited by the major laser lines of fluorescence instruments (e.g., 350, 405, 488, 555 and 633 nm).