Ready-to-use ELISA kits are available for the detection of H4FA, an alias of the protein, histone cluster 1 H4 family member a. The official gene symbol is HIST1H4A. The kits can detect several species variants of the protein, including: human, mouse, rat, and chicken. The protein has a mass of 11.4 kDa and length of 103 residues. It may be known by other names, including: histone cluster 1 H4a, histone 1 H4a, H4 histone family member A, and histone H4.