This sequence represents IGHV5-51*03 C228T in the IMGT numbering system. The committee noted a rearrangement frequency of 1.25%, with 1128 alignments including 304 perfect matches to the inferred allele. There was abundant variation in the CDR3 regions of the aligned sequences. The genotype showed the individual to be heterozygous at the IGHV5-51 locus, with the alternative IGHV5-51*03 allele being associated with 1539 sequences for an allele ratio of 42:58. The sequence was affirmed at level 1 at IARC Meeting 33 on March 15, 2019. The sequence is affirmed only up to and including base 318, the final base of the inference and its GenBank record, and of the corresponding closest allele (IGHV5-51*03) in the IMGT database.