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[Leukocyte migration inhibiting factor in preparations of alpha and gamma interferons].

High titres of leukocyte migration inhibition factor (LMIF) activity were found in native and partially purified preparations of human alpha- and gamma-interferon. In the course of chemical purification of interferon up to 98% of LMIF was lost. The highest content of LMIF was in gamma-interferon preparations, while recombinant alpha 2-interferon (reaferon) showed no LMIF activity.