Quick easy read with reference to the much more thorough long version.
Much appreciation, Dr. Buchanan.
For fossils as old as dinosaurs (over 65 million years), the conventional wisdom has been that no original organic material could remain. If the delicate structure of soft body parts is discernable, that is only because these parts were converted to some type of inorganic mineral in the fossilization process.
However, over the past two decades, paleontologist Mary Schweitzer has rocked our world by presenting visual evidence of soft tissues recovered from the interior of dinosaur bones, and biochemical evidence indicating that these are in fact the remnants of the original cells and structures from within the dinosaur bone pores. For instance, here is a network of blood vessels, containing little round red things that look like red blood cells:
High magnification of dinosaur vessels shows branching pattern (arrows) and round, red microstructures in the vessels. Source: Schweitzer, et al., “Soft-Tissue Vessels and Cellular Preservation in Tyrannosaurus rex”, Science, 307…
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