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Redundancy in the invasion module of Plasmodium falciparum. If a given erythrocyte receptor is inactivated because of the presence of an enzyme, such as neurominidase (“Nm”), trypsin, or chymotrypsin (“Chymo”), there are other pathogen antigens that can bind to other erythrocyte receptors, facilitating invasion. [From J. Baum et al., PLoS Pathog. 1, e37 (2005).]
