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Growth of strain YA01 (A) and its closest species, Caldicellulosiruptor hydrothermalis 108 (B), Caldicellulosiruptor kronotskyensis 2002 (C), Caldicellulosiruptor bescii DSM 6275 (D) with (open symbols) or without (closed symbols) ammonium under a N2 or Ar atmosphere. Error bars indicate the standard deviation of three replicates.
