A one-stage test for simultaneous study of migration inhibition factor of peripheral leukocytes (LIF) and migration inhibition factor of mouse spleen cells (MSIF).

A one-stage modification of the test of the migration inhibition is described, which permits stimultaneous study of the factor influencing in vitro migration of peripheral blood leukocytes and mouse spleen cells. The results of this correlate with the results of the two-stage test.