9:15 AM. 268. Impact of Estradiol-Priming on Elastic Matrix Regenerative Properties of Stem Cell Extracellular Vesicles and their Biodistribution in a Rat Abdominal Aortic Aneurysm Model.Ali Abba Mutah, MS1, Anand Ramamurthi, PhD, FAHA1 1LEHIGH UNIVERSITY, BETHLEHEM PA.