[Potency determination of horse anti-human-lymphocyte serum (ALS) by means of the lymphocyte resistance test, a modification of Schroder's leukocyte resistance test].

The leukocyte resistance test of Schröder was used for the purpose of modifying the in vitro determination of cytotoxic potency of ALS during the course of immunization. In contrast to the original method, where the test was carried out with whole blood, the incubation was made with pure lymphocyte cell suspensions. The results obtained show that the extensive procedure of examination enables the cytotoxic effectiveness of antilymphocytic antibodies to be evaluated.