the apparent greater immunogenicity of heart allografts as compared with islets in this model could be due to ( 1 ) a quantitative difference between the number of residual class ii-positive cells in hearts and islets or a greater nnon-mhc antigenic load in the heart grafts given its larger size , or ( 2 ) a quanlitative difference between hearts and islets due to the presence of a vascular endothelium in the immediately vascularized heart that can present alloantigen and provide a major stimulus to rejection .
C0018823
heart grafts
C0018787
heart