Using CEST NMR to discover previously unobserved states on the free energy surface of proteins: Application to the L99A cavity mutant of T4 lysozyme - Ved Prakash Tiwari; Nihar Pradeep Khandave; D. Flemming Hansen; Guillaume Bouvignies; Lewis E. Kay; Pramodh Vallurupalli (Journal of Biological Chemistry, 2026)