What is the term given for similarity between HLA genes of donor and recipient?

What is the term given for similarity between HLA genes of donor and recipient? Correct Answer Histocompatibility

The degree of similarity between the HLA genes of the donor and recipient is known as histocompatibility. If donor and recipient are genetically compatible at a higher level, the recipient’s tolerance level also increases during organ implantation or grafting. In cases where the donor and recipient are genetically not identical or are dissimilar, there can be chances of rejection. This can even reduce the original response of immune system.
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