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Electrophoresis of HLA-DQB1 alleles amplification by PCR/SSP. M: pBR322DNA/MSP I marker, 1: negative control, 2: 0201, 3: 0201/0302, 4: 0301, 5: 0302/0303, 6: 0303, 7: 0401, 8: 0402, 9: 0501, 10: 0502, 11: 0503, 12: 0601, 13: 0602, 14: 0603, 15: 0604.
