Final answer:
A graft moved from one identical twin to the other is called an isograft, and such grafts seldom face rejection due to matching HLAs.
Step-by-step explanation:
A graft that is transplanted from one person to a genetically identical individual, such as to an identical twin, is known as an isograft. In cases where the twins are monozygotic, which means they are genetically identical, the transplanted tissue is virtually never rejected due to the match in human leukocyte antigens (HLAs). This is in contrast to other types of grafts like allografts, which involve transplanting tissue between genetically distinct individuals, or xenografts, where the tissue comes from a different species.