4-Nitroaniline-derived caspase substrate widely used for the colorimetric detection of various caspase activities. Cleavage of pNA peptides by caspases generates pNA that is monitored colorimetrically at ~405 nm. pNA has maximum absorption around 408 nm. Thornberry, NA; et al., Nature, 356, 768, (1992); Grutter M.G., Curr. Opin. Struct. Biol., 10, 649 (2000); Gastman B.R., Head Neck, 23, 409 (2001).
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