[Lymphokine-like activity in a culture of cells of the embryonal human brain and in the cerebrospinal fluid].

Factors functionally similar or even identical to interleukin-1 (IL-1) and interleukin-2 (IL-2) were found in the tissues of human embryo. These factors were found to be in reciprocal interrelationship. No activity of colony-stimulating factor was found in materials of cerebral origin.