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The results of the serological analysis, DNA sequencing and TA cloning. A The ABO phenotype was determined by an IH-1000 system. B A heterozygous mutation (A/G) was detected at c.361 (upper panel), and the sequence of the isolated variant FUT1 allele after cloning was shown (lower panel). C TT deletion at position c.881_882 (upper panel) and haplotype of the FUT1c.881_882 delTT (lower panel).
