DNA probes to the human interleukin 4 (IL4) and interleukin 6 (IL6) genes have been used for in situ hybridization to normal human chromosomes and Southern blot analysis of a series of mouse-human hybrid cell lines.IL4maps to 5q31, the same location asIL5and other haemopoietic growth factor genes.IL6maps to 7p15. The significance of these locations is discussed.
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