FORMATION OF AN AMINO ACID BINDING POCKET THROUGH ADAPTIVE ZIPPERING-UP OF A LARGE DNA HAIRPIN LOOP, NMR, 9 STRUCTURES DNA, ADAPTIVE DNA STRUCTURAL TRANSITIONS, L-ARGININAMIDE BINDING POCKET, MOLECULAR RECOGNITION OF AN AMINO ACID, MINOR GROOVE RECOGNITION, BASE ENCAPSULATION WITHIN MINOR GROOVE, DNA APTAMER, DEOXYRIBONUCLEIC ACID 2ARG