Large neutral amino acids transporter small subunit 1 (SLC7A5)

Sodium-independent, high-affinity transport of large neutral amino acids such as phenylalanine, tyrosine, leucine, arginine and tryptophan, when connected with SLC3A2/4F2hc. Involved in cellular amino acid uptake.

Acts as an amino acid exchanger. Involved in the transport of L-DOPA throughout the blood- brain barrier, and that of thyroid hormones triiodothyronine (T3) and thyroxine (T4) across the cell membrane in cells like placenta.