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Neighbor-Joining trees obtained from deduced amino acid sequences of hcd genes in the HP/HB cycle derived from this study (shown in blue letters) and representative thaumarchaeal sequences from NCBI and IMG databases. Bootstrap values are shown as percentages of 1000 replicates and values over 50% are indicated on nodes. Scale bar indicates 10% changes in the amino acid sequence. [Color figure can be viewed at wileyonlinelibrary.com]
