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a) View of the helical face of PAS domains. b) View of the β-sheet face of PAS domains. Colors are: hERG in redbrick, mEAG in green and dELK in blue. The N-terminal helix in dELK PAS domain (absent in the other two structures) is shown in light blue. N- and C- terminal are labeled in b). Several structural features discussed in the text are labeled.
