[The action of the supernatants from human lymphocyte cultures on E-active rosette formation].

Lymphocytes separated from 20 normal subjects were introduced in two rosetation systems: the first was modulated rosetation (REM) with phytohemaglutinina (PHA), concanavalina A (Con. A). Mycobacterium tuberculosis (Mbt), and tumoral extract from ocular malignant melanoma (ET-MMO): the second was E-active modulated rosetation with supernatants from human lymphocyte cultures stimulated with PHA, Con A, Mbf and ET-MMO (REM-S), he average values of percentages of rosettes forming cells in the two systems REM and REM-S are comparable. We may assume the existence of some modulating factors which operate in the same manner on the functionality of T-lymphocyte in the two systems (REM and REM-S).