This image released by the University of Toronto shows a preserved femora, thigh bone, in cross section in middle of the shaft. The purple color is caused by the lamba filter used for effective ... more 
This image released by the University of Toronto shows a preserved femora, thigh bone, in cross section in middle of the shaft. The purple color is caused by the lamba filter used for effective visualization. The honeycomb like external area is embryonic bone tissue with large primary spaces for blood vessels, bone making cells called osteoblasts, and other soft tissues needed for growth. The central portion is the medullary cavity, but in this case filled with crystals that formed during fossilization. An international team of scientists discovered a cache of dinosaur embryos near the city of Lufeng, in Yunnan, China . Estimated to be 190 million years old, the fossilized bones are among the oldest dinosaur embryos in the world. (AP Photo/University of Toronto, A. LeBlanc) less 
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Associated Press | Photo By University of Toronto, A. LeBlanc
Wed, Apr 10, 2013 1:49 PM EDT