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Aims Intron 1 inversion (Inv1) is a recurrent causative mutation of haemophilia A (HA) and is responsible for 1-5 %of severe HA.Inv1 occurs as a result of intrachromosomal homologous recombination between int1h-1 within intron 1 and int1h-2 located in approximately 125 kb telomeric to the F8 gene.