Abstract
Lymph node cells of immunized mice were lysed by specific antigen in vitro. These cells were not lysed by antigen after washing them four times with Hanks' solution. The factor lysing lymph node cells and thymus cells of normal mice in the presence of the specific antigen was found in the supernatant of the lymph node cell suspension of immunized mice. Bone marrow cells were also lysed by the factor and specific antigen only after preincubating the cells in extracts of thymus or lymph nodes of normal mice. When active supernatants were fractionated by gel filtration on Sephadex G-200, the active material eluted with molecules of approximately 20,000–45,000 MW. This factor was homogeneous on electrophoreses in polyacrylamide gels and detected in the prealbumin zone.
Published Version
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