Radiolabeled markers such as 18F-FDOPA (Rozenblum et al., 2020) and 18F-AMT (Krasikova et al., 2020) accumulate inside tumor cells via the l-type amino acid transporter 1 (SLC7A5; LAT1) and are used for brain function imaging and tumor metabolism research. The gene discussed is SLC7A5; the disease is neoplasm.