Fig. 1From: Metagenomic analysis of ancient dental calculus reveals unexplored diversity of oral archaeal MethanobrevibacterA Spatial and B temporal location of the 20 dental calculus samples in this study. Archaeological time periods based on [20]. C Dental calculus on the mandibular teeth of the early medieval individual 2100, found in the burial site of Burgusio Santo Stefano (St. Stephan ob Burgeis) in South Tyrol, ItalyBack to article page