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FRET histogram of H-Telo (a) in absence of K+ in the unfolded state, (b) folded in F1 and F2 states upon addition of 10 mM K+, (c) addition of tetramer 3 after 2 min, (d) 20 min, (e) addition of octamer 4 after 20 min, (f) 30 min. after removing free K+ and 4.
