[Conformational changes in the membranes of antigenically stimulated macrophages].

The conformation changes taking place in the membrane of antigen-stimulated macrophages were followed up by means of serologic methods and agglutination with concavalin A. It was found that: 1. Following antigen stimulation the receptors, located in the cell membrane, are saturated with a lower amount of concavalin A than the receptors of unstimulated macrophages. 2. Antigen stimulation enhances the agglutinogenic capacity of macrophages. The conformation changes observed are discussed in brief.