ABSTRACT

Macrophage-MediatedCellDestruction453

giverisetohighnumbersofcloselyboundantibodies.Low-densityantigenssuchasRhresult inwidelyspacedantibodybinding.Notonlywilltheantibodydensityaffecttheinteraction withtheFereceptorsbutitwillalsodeterminetheextentofcomplementdeposition.Although asingleIgMmoleculecaninitiatecomplementactivation,severallgGmoleculesmustbe sufficientlycloseforcomplementactivation.