Fig. 3 in Soft-Tissue Vessels and Cellular Preservation in Tyrannosaurus rex

Fig. 3. SEM images of aldehyde-fixed vessels. (A) Isolated vessel from T. rex. (B) Vessel isolated from extant ostrich after demineralization and collagenase digestion (3). (C) Vessel from T. rex, showing internal contents and hollow character. (D) Exploded T. rex vessel showing small round microstructures partially embedded in internal vessel walls. (E) Higher magnification of a portion of T. rex vessel wall, showing hypothesized endothelial nuclei (EN). (F) Similar structures visible on fixed ostrich vessel. Striations are seen in both (E) and (F) that may represent endothelial cell junctions or alternatively may be artifacts of the fixation/dehydration process. Scale bars in (A) and (B), 40 um; in (C) and (D), 10 um; in (E) and (F), 1 um.