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NMR structures of RegB, RelE and YoeB endoribonucleases. The structures of RegB [29], RelE [144] and YoeB [145] are shown. The first α-helix of RegB, absent in the two other endoncleases, is drawn in pale orange. The two conserved α-helices are in red and orange and the conserved four-stranded β-sheet is in cyan.
