design: Amplicon sequencing of CTRL4_2. Sequencing was performed as described in https://doi.org/10.3389/fmicb.2021.669776. {primers: GTGYCAGCMGCCGCGGTAA + GGACTACNVGGGTWTCTAAT, nucleic acid: DNA, flow cell identifier: LM67Y, barcoding: UDB-H12, plate-position: 6 G1, barcodes: TACGATGAGTTG + TACGAGCCCTAA}.