Interleukin 1 was isolated from human lymph drained from normal skin. The lymph was separated by gel filtration chromatography on Spherogel TSK SW 2000 column. IL-1 activity was found in three fractions: greater than 70 kD, 13-16 kD and 5-5.5 kD. Additionally a slight IL-1 activity was found in the 36-40 kD fraction. When exogenous IL-1 was added to the lymph inhibitory activity was detected in fractions: greater than 70 kD, 22-30 kD and 5.5-8 kD.
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