Immunoglobulin M hemagglutinin and antibody cytophilic for macrophages were produced simultaneously in mice after primary antigenic stimulation with sheep erythrocytes in saline. Antigen emulsified in Freund's complete adjuvant induced formation of cytophilic antibody (CA) in high titer. Purified cytophilic globulin was isolated by permitting it to attach to macrophages in vitro and eluting it at 56 C. The chromatographic elution pattern, molecular weight, and resistance to mercaptoethanol suggested that CA is a member of the immunoglobulin G class of immunoglobulins.
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