Anti-H1.7 linker histone antibodies are used for the immunodetection of the protein encoded by the H1-7 gene. In humans, the canonical protein has a reported length of 255 amino acid residues and a mass of 28.1 kDa. Its subcellular localization is in the nucleus. It is reported to have testis-specific expression. A member of the Histone H1/H5 protein family, it is known to be important for normal spermatogenesis and male fertility. Other names for this target antigen include H1 histone family member N, testis specific, HANP1, haploid germ cell-specific nuclear protein 1, histone H1.7, histone H1t2, and testis-specific H1 histone. Gene orthologs have been identified in the mouse, rat and chimpanzee species.