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Human mononuclear cells activated by streptokinase-streptodornase have been shown to elaborate a factor capable of releasing histamine from human basophils. We have developed reproducible methods for its production in large quantities by using cells obtained from leukapheresis packs, by detection utilizing donor basophils known to release well with anti IgE, and by quantitation of histamine by the radioenzyme method. Human histamine-releasing factor (HRF) gave a single peak upon gel filtrationdoi:10.4049/jimmunol.135.3.2027 fatcat:3nv4bz4l2zdwxax447agoc7vxe