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Structural alternatives of PSTVd’s left-terminal domain. The gray-boxed and black-boxed nucleotides highlight two complementary repeat units, which principally give rise to the two alternative structures: rod-like (left) and branched (right). The rod-like structure is thermodynamically highly favored according to analyses of sequence covariation, energy predictions, TGGE, UV melting experiments and NMR (151).
