Fig. 1From: Ultramicrostructural reductions in teeth: implications for dietary transition from non-avian dinosaurs to birdsEnamel characterization and dietary evidence indicated through paravian phylogeny. SEM images showing the internal structure of sectioned teeth from Paraves with a emphasize of avialans (aTroodontid, bAnchiornis, c and d Microraptorines 1 and 2, eJeholornis, f indet. Ornithurine, gLongipteryx and hSapeornis. Abbreviations: Ena, enamel; EDJ (labeled white dashed line), enamel-dentin junction. All scale bar equals to 5 μmBack to article page