Cryopreservation of immunological memory and other lymphoid cell functions.

The following components of the immune response by mouse spleen cells were retained after cryopreservation at --110 degrees C: direct and indirect plaque formation, avidity of antibody secreted by plaque forming cells, and induction of primary or secondary adoptive transfer responses. Human peripheral blood lymphocytes retained the capacity to mediate antibody-dependent cytotoxicity and cell mediated immunity to tumor in vitro.