AF 594 streptavidin is a bioconjugate comprising AF 594 and streptavidin, functioning as a derivative of the red fluorescent dye AF 594. This compound exhibits high fluorescence quantum yield and photostability, with a peak excitation wavelength at 594 nm and a peak emission wavelength at 615 nm. It selectively binds to streptavidin-modified molecules via streptavidin groups, making it suitable for applications in fluorescence labeling and spectroscopic analysis.