File permafrost.fulldata.csv
This csv file contains the full database used for the data analysis.
Data collection:
Eske Willerslev and Mary E. Edwards supervised the collection of permafrost samples
James Haile performed the DNA extraction
Ludovic Gielly performed the DNA amplification
Corinne Cruaud and Patrick Wincker performed the DNA sequencing
Eric Coissac performed the sequence data analysis
Contact author:
Eric Coissac (eric.coissac@inria.fr)
Column headings:
    Site: Sampling site name
    Entity: Entity name
    country: Sampling site country
    region: Sampling site region
    LatitudeDD: Latitude decimal degree
    LongitudeDD: Longitude decimal degree
    extraction: Extraction name
    Age: Age of the sample
    Age_type: Method used for age estimation
    primer: the primer amplifying this sequence
    dbname: reference database name used for identification
    scientificname: scientific name of the taxon
    rank: taxonomic rank of the taxon
    taxid: ncbi taxid of the taxon (internal if > 10000000)
    species_taxid: corresponding species taxid
    species: corresponding species scientific name
    genus_taxid: corresponding genus taxid
    genus: corresponding genus scientific name
    family_taxid: corresponding family taxid
    family: corresponding family scientific name
    order_taxid: corresponding order taxid
    order: corresponding order scientific name
    okrepeats: repeat count where the taxa was seen
    usablerepeats: available repeat count for this extraction
    frequency: sequences count of for this motu in the extraction (cumulated over all the usable repeats) 
    relfreq: relative frequency per extraction per primer (see above)
    bestmatch: identity ratio with the more similar sequence in the selected reference database
    seqid: internal sequence identifier
    nucsequence: nucleic sequence