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Possible operon structure of some candidate members of the heat shock regulon in the archaea. Blue, helix–turn–helix DNA-binding protein; green, A1 family ATPase; red, chaperone hsp20; yellow, grpE–dnaK–dnaJ gene string; black, candidate heat shock regulatory site; grey, weak heat shock site; white circles, delimiters. If there are several paralogs, only one is shown (see Table 1 for details).
