A-2 is the symbol for the human gene, ATPase, H+ transporting, lysosomal V0 subunit a2. Other names include: V-type proton ATPase 116 kDa subunit a isoform 2; V-ATPase 116 kDa isoform a2; Lysosomal H(+)-transporting ATPase V0 subunit a2; TJ6; Vacuolar proton translocating ATPase 116 kDa subunit a isoform 2; infantile malignant osteopetrosis; ARCL; ARCL2A; ATP6A2; ATP6N1D; J6B7; RTF; TJ6M; TJ6S. The encoded protein has an amino acid length of 856 and a mass of 98.1 kDa. A-2 is a member of the V-ATPase 116 kDa subunit family. This gene shares homology with other species, including: Mouse, Rat, Zebrafish, Frog, Chicken.