HILS1 is a symbol for the gene, Histone linker H1 domain, spermatid-specific 1 (pseudogene), in humans. Other names include: Spermatid-specific linker histone H1-like protein; H1.9; histone linker H1 domain, spermatid-specific 1, pseudogene. The encoded protein has an amino acid length of 231 and a mass of 25.6 kDa. This gene shares homology with other species, including: Mouse, Rat.