Hierarchical-clustering heat-map of the relative abundance of the 20 most abundant bacterial genera.

<p>Hierarchical-clustering heat-map of the relative abundance and the clustering dendrogram of different groups and the 20 most abundant bacterial genera, using Euclidean distance. Color intensity indicates abundance, ranging from black (absence), blue (low abundance) to red (high abundance). All of samples are combined to 84 groups based on age, gender, residence, and skin site. The abbreviations and the corresponding explanations are given in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0141842#pone.0141842.g001" target="_blank">Fig 1</a>. For example, M.A.R.Gb means the group involved samples which are from a rural (R) male (M) adult’s (A) glabella (Gb). Classifications are to the genus (gen), family (fam), order (ord) or class (cla) level. For each taxon, the phylum is also indicated: Act, Actinobacteria; Bac, Bacteroidetes; Cya, Cyanobacteria; Fir, Firmicutes; Pro, Proteobacteria. Taxa are classified to the highest taxonomic level to which they were confidently assigned. For the details see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0141842#pone.0141842.s006" target="_blank">S3 Table</a>.