There is good agreement between the target molecular weight and the known molecular weight of human leukocyte interferons (about 20,000). The target molecular weight of fibroblast interferon, 31,000 to 42,000, is significantly larger than the monomer molecular weight of 21,000 to 24,000, suggesting that the dimer may be the predominant active functional unit in solution. A range from 63,000 to 73,000 for the target molecular weight of several different fractions of immune interferon (including natural crude as well as the recombinant form) indicates that the functional form of the immune interferon may be a trimer or tetramer. Thus, these studies indicate that the functional unit of leukocyte interferon is the monomer, that of fibroblast interferon is a dimer, and that of immune interferon is probably a tetramer (or trimer).
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