Atto 590 NHS ester may be suitable for use in site-specific labeling of human embryonic kidney (HEK293T) cell lysates for western blotting, fluorescence, and widefield microscopy studies.', 'Molar absorption 120,000 1/M cm, abs: 593 nm, em: 620 nm, QY=0.93, Tfl 4.0 ns (unpublished data)