18S rRNA amplicon sequences: Nadx18x6
18S rRNA gene libraries were prepared using bacterial/archaeal primers 1391f/EukBr targeting the V4 region of the 18S rRNA gene. Library preparation and sequencing were conducted according to the standard protocol (Version 4_13) of the Earth Microbiome Project and libraries were paired-end sequenced using the Illumina MiSeq platform.