passages.id: split_9_validation_336_passage
passages.type: progene_text
passages.text: We compared antibody and memory B cell responses to tetanus toxoid with those to 3 Plasmodium falciparum candidate vaccine antigens : the C - terminal portion of merozoite surface protein 1 ( MSP1 ( 19 ) ) , apical membrane antigen 1 ( AMA1 ) , and the cysteine - rich interdomain region 1 alpha ( CIDR1 alpha ) of a protein from the P. falciparum erythrocyte membrane protein 1 ( PfEMP1 ) family .