There are a number of ELISA Kits available for the measurement of Hist5-2ax, another term for the human protein, H2A histone family member X. Other synonyms may include: histone H2AX, H2AX histone, histone H2A.x, H2A.X, and H2AX histone. It is encoded by the H2AFX gene to yield a protein 143 amino acids in length and 15.1 kDa in size. The protein is categorized into the Histone H2A family. Versions of Hist5-2ax are present in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.