Elution of macrophage-bound immunoglobulins by temperature changes in vitro.
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Some mouse anti-sheep-erythrocyte macrophage cytophilic antibodies are more readily adsorbed to cells at 4 than at 37. By treating cells with serum at 4, washing them well and eluting bound material at 30, it was found possible to isolate cytophilic immunoglobulins. These were found to have fast -mobility, but were heterogeneous upon preparative ultracentrifugation and gel-filtration. The macrophage eluate contained relatively high titres of anti-sheep-erythrocyte cytophilic antibodies.