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Professor Steven G. E. Marsh, Anthony Nolan Research Institute, Royal Free Hospital, Pond Street, London NW3 2QG, UK. Tel. +144 20 7284 8321; Fax +144 20 7284 8331; e‐mail: steven.marsh@ucl.ac.uk; URLs: hla.alleles.org; www.anthonynolan.org/hig; www.ebi.ac.uk/imgt/hla
for the WHO Nomenclature Committee for Factors of the HLA System