English: This diagram shows serological typing. In the top diagram, the correct antibody for the HLA type of the cell was added, so complement activation occurred, leading to cell lysis. Cell lysis indicates that the antibody added matched the HLA type of the cell, so the HLA type of the cell is then known. In the bottom diagram, an HLA antibody that did not match the cell's HLA type was added, so there was no complement activation, and no cell lysis occurred.
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