Assignment of the haemophilia B (factor IX) locus to the q26-qter region of the X chromosome.

Summary Two independent approaches have provided an assignment for the factor IX (Haemophilia B) locus to Xq26–qter, the distal region of the X chromosome long arm. Cloned DNA sequences of the gene were hybridized to restriction enzyme digests of DNA prepared from a series of somatic cell hybrids containing different X-chromosomal regions and also in situ to prepared metaphase chromosomes.