SLC7A5 (Large neutral amino acids transporter small subunit 1), also known as 4F2 light chain, or CD98 light chain is a protein that in humans is encoded by the SLC7A5 gene. It is suggested to play a part in altered cell metabolism and proliferative signaling and has been reported to be overexpressed in various types of cancer, including breast cancer [PMID: 34792178].