passages.id: split_8_test_2232_passage
passages.type: progene_text
passages.text: Three of these eight , expressed as recombinant proteins ( 32 kDa neuraminyl - lactose - binding haemagglutinin precursor , 30 kDa peptidoglycan - associated lipoprotein precursor and 22 kDa hypothetical protein HP0596 ) , reacted specifically with sera from infected patients , while the 14 kDa 50S ribosomal protein L7 / L12 cross - reacted with one out of five sera from H. pylori - negative patients .