Ac-VEID-pNA is a substrate for caspase-6. Caspase-6 binds to and cleaves the Val-Glu-Ile-Asp (VEID) peptide sequence to release p-nitroanilide (pNA), which can be quantified by colorimetric detection at 405 nm as a measure of enzyme activity.1WARNING This product is not for human or veterinary use.