The use of frozen-stored sheep erythrocytes for demonstrating lymphocytic membrane markers.

The usefulness of cryopreserved sheep erythrocytes (unsensitized or coated with fluorescein, IgG-type antibody or complement) for marker tests on human blood lymphocytes was studied. It appears that the rosetting properties or freshly prepared or frozen-stored erythrocytes are not significantly different. The method may be used to provide homogeneous stocks of sensitized erythrocytes for lymphocyte rosetting technique.