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Photomicrograph of a wild-type pig heart that ceased functiong within an hour of being continually perfused by baboon ABO-compatible blood (in an experiment carried out in 1985). Interstitial hemorrhage and edema are promineny features of hyperacurte rejection (Hematoxylin and eosin, x150).The appearances are similar to those shown in Figure 4, panel B, of the Maryland report (Griffith et al., 2022, reference 1)
