Fusion protein amino acids 1-63 (cytoplasmic N-terminus) of rat SNAT1 (also known as sodium-coupled neutral amino acid transporter 1, amino acid transporter A1, ATA1, glutamine transporter, system A transporter 2, N-system amino acid transporter 2, system A amino acid transporter 1, system N amino acid transporter 1, solute carrier family 38 member 1, Glnt, Sa2 and Sat1, accession number Q9JM15) Mouse: 100% identity (63/63 amino acids identical) Human: 96% identity (61/63 amino acids identical)