Fossilized Red Blood Cells (IMAGE) Oregon State University Caption This piece of amber contains the first fossilized red blood cells from a mammal ever discovered -- in this case, infected by a parasite. Credit Photo by George Poinar, Jr., courtesy of Oregon State University Usage Restrictions None License Licensed content 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.