- Adenoviral PR39 improves blood flow and myocardial function in a pig model of chronic myocardial ischemia by enhancing collateral formation. Post, M.J., Sato, K., Murakami, M., Bao, J., Tirziu, D., Pearlman, J.D., Simons, M. Am. J. Physiol. Regul. Integr. Comp. Physiol. (2006)