Pavlova N, Hui S, Ghergurovich J, Fan J, Intlekofer A, White R, Rabinowitz J, Thompson C, Zhang J. As Extracellular Glutamine Levels Decline, Asparagine Becomes an Essential Amino Acid. Cell Metab. 2018;27(2):428–438.e5. PMCID: PMC5803449