Fig. 3
From: A comparative study of ammonia-oxidizing archaea and bacteria in acidic and alkaline purple soils
a Neighbor-joining phylogenetic tree of AOB amoA sequences retrieved from the ACI and ALK libraries. Filled circles (red ACI, blue ALK) Sequence numbers from this study, open black triangles reference sequences. Bootstrap values (>50) are indicated at branch points. Scale bar represents 5Â % estimated sequence divergence. b Composition analysis of the bacterial amoA in the ALK (a) and ACI (b) libraries