Fig. 2.

Two-way hierarchical cluster of binary levels for 17 samples across 63 species/taxa. Sample groupings were similar to those of the principal component analysis (Fig. 1). Species grouped in four clusters (color coded). The figure illustrates the fewer species detected in pulp than in caries samples of the same children although S. mutans, V. parvula, and V. atypica were detected in most samples.