16S rRNA gene amplicon sequencing of negative control: empty wells
Empty PCR wells (No DNA, no PCR products; unused tag combinations). Amplicons were sequenced with an Illumina MiSeq platform, using the 2  300-bp protocol (Fasteris SA). Paired-end reads were aligned and assigned to the corresponding sample (number of errors allowed for matching primers = 2) using the OBITools package.