There are a number of ELISA Kits available for the measurement of Autophagy-related 4A, another term for the human protein, autophagy related 4A cysteine peptidase. Other synonyms may include: cysteine protease ATG4A, APG4 autophagy 4 homolog A, ATG4 autophagy related 4 homolog A, AUT-like 2 cysteine endopeptidase, autophagy-related cysteine endopeptidase 2, autophagy-related protein 4 homolog A, and hAPG4A. It is encoded by the ATG4A gene to yield a protein 398 amino acids in length and 45.4 kDa in size. However, there are up to 4 reported isoforms. The protein, an enzyme, is categorized into the Peptidase C54 family. Versions of Autophagy-related 4A are present in other organisms, including: Mouse, Rat, Frog.