The human gene ATP8B3 encodes the protein ATPase, aminophospholipid transporter, class I, type 8B, member 3.
Alternatively spliced transcript variants encoding different isoforms have been found for this gene.
The protein encoded by this gene belongs to the family of P-type cation transport ATPases, and to the subfamily of aminophospholipid-transporting ATPases. The aminophospholipid translocases transport phosphatidylserine and phosphatidylethanolamine from one side of a bilayer to another. This gene encodes the member 3 of the phospholipid-transporting ATPase 8B.