Fig.2 Specific labeling of fluorescent dye into proteins

a) Outline of fluorescent-labeling with puromycin-fluorophore conjugate

b) Chemical structures of puromycin-fluorophore conjugates

c) FLASH and proposed structure of its complex with a ƒ¿-helical tetracystein-containing tag

d) Fluorescein-NTA and proposed structure of its complex with a histidine-tag