design: Amplicon sequencing of CR07_pre. Sequencing was performed as described in https://doi.org/10.3389/fmicb.2021.669776. {primers: GTGYCAGCMGCCGCGGTAA + GGACTACNVGGGTWTCTAAT, nucleic acid: DNA, flow cell identifier: KD98K, barcoding: UDB-H12, plate-position: 4 B8, barcodes: CAAGTCGAATAC + CAAGAGCGGATG}.