Looking for DNA in Preserved Dinosaur Osteocytes (image) North Carolina State University Share Print E-Mail Caption T.rex (B), B. canadensis (E) and ostrich osteocytes (H) showing positive response to propidium iodide, a DNA intercalating dye. Credit Dr. Mary Schweitzer, NC State University Usage Restrictions Please include credit and caption information. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.