TABLE 1.

Overview of the number of features at each taxonomic level before and after preprocessing as described in Materials and Methods

Taxonomic level	No. of features		% of features kept after preprocessing
	Before preprocessing	After preprocessing
Phylum	19	9	47.4
Class	36	19	52.8
Order	65	28	43.1
Family	124	54	43.5
Genus	316	115	36.4
OTU	20,079	705	3.5
ASV	104,106	478	0.5