File Diet_GNP17_trnL_raw_data.fasta This fasta file contains unfiltered sequences amplified by g (5'-GGGCAATCCTGAGCCAA-3') and h (5'-CCATTGAGTCTCTGCACCTATC-3') primers Sequences have been produced by Illumina HiSeq 2500 (2 x 150bp paired-end). Initial processing steps were performed using the OBITOOLS software (Boyer et al. 2016). Direct and reverse reads corresponding to the same sequence were aligned and merged thanks to the IlluminaPairedEnd program. Only merged sequences with a high alignment quality score were retained (>=40). Each merged sequence was assigned to its original sample using the tags information previously added to primers thanks to the ngsfilter program. Only sequences containing both primers (with a maximum of 2 mismatches per primer) and exact tag sequences were selected. Strictly identical sequences were merged together. Data collection: Matthew Hutchinson, Arjun Potter, Christina Hansen and Johan Pansu. Matthew Hutchinson and Arjun Potter collected fecal samples. Matthew Hutchinson, Arjun Potter, Christina Hansen and Johan Pansu performed DNA extractions. Matthew Hutchinson, Arjun Potter and Johan Pansu performed DNA amplifications. Sequencing was performed by the Lewis Singler Institute for Integrative Genomics at Princeton University (Princeton, NJ, USA) Matthew Hutchinson and Johan Pansu performed data filtering. Contact authors: Robert Pringle (rpringle@princeton.edu) and Johan Pansu (johan.pansu@gmail.com) The header of each sequence contains: (i) the ID for the sequence (ii) the total number of occurrence of the sequence in the dataset (count) (iii) the number of occurrence in the different PCRs (merged_sample) Code for identifying PCR samples: (i) Digits 1-14 in sample names correspond to the sample name in the associated metadata file (ii) The last digit corresponds to the PCR replicate (a, b or c) (iii) PCR sample names starting by "PNG_17_EC", "PNG_17_PC" correspond to extraction and PCR controls, respectively: -PNG_17_ECxx: Blank extraction control xxx -PNG_17_PCxx : Blank PCR control xxx