4F2, or Solute carrier family 3 (amino acid transporter heavy chain), member 2, is a human gene encoded by SLC3A2. It may also be known as: 4F2 cell-surface antigen heavy chain heavy chain antigen; Lymphocyte activation antigen 4F2 large subunit; Solute carrier family 3 member 2; CD antigen CD98hc; antigen identified by monoclonal antibodies 4F2, TRA1.10, TROP4, and T43; antigen defined by monoclonal antibody 4F2; heavy chain heavy chain; CD98 heavy chain; monoclonal antibody 44D7; 4T2HC; CD98HC; MDU1; NACAE. The encoded protein has an amino acid length of 630 and a mass of 68.0 kDa. Other isoforms may exist. 4F2 is a member of the SLC3A transporter family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.