The family was blood-grouped serologically as AB phenotypes,while PCR-SSP assay showed as O/O phenotypes,but direct DNA sequencing at exons 6 and 7 of ABO gene indicated that they were B(A)/O phenotypes.

• 该家系中血型血清学定型为AB型的成员DNA序列分析测定基因型为B(A)/O型,而PCR-SSP法检测AB型成员的基因型为O/O型。