Leukocyte and fibroblast interferon genes are located on human chromosome 9.

Abstract
At least 8 leukocyte interferon genes (IFL) and the single fibroblast interferon gene (IFF) were located on chromosome 9 in humans. In somatic cell hybrids of human and mouse cells containing a normal complement of mouse parental cell chromosomes but reduced numbers of human chomosomes, the human leukocyte and fibroblast interferon DNA sequences were present only when human chromosome 9 was present.