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Occurrence of different types of S4 throughout the bacterial phylogeny. Length of each bar is scaled to match the percentage of the corresponding type of sequences in the group. Colors indicate the sequence classifications: (white) C+, (gray) C-(I) – C-(III), (blue) C-(IV), and (yellow) C-(V). Boxes with hatch marks are paralogous sequences, which are of different types inside (green background) or outside (red background) the α-operon.
