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The number of alleles in the IPD-IMGT/HLA database by year from 1999 to 2016. The database releases updates four times a year (January, April, July, and October) and the plot is based on the number of alleles from all the April releases reported on the statistics page of the IPD-IMGT/HLA website (http: //www.ebi.ac.uk/ipd/imgt/hla/stats.html). HLA human leukocyte antigen
