the use of factor sera permitting the differentiation of the variants , described in earlier . works , among the flagellar antigens of e. coli , formally denoted as h2 , h4 , h7 , h10 and h34 in accordance with their official nomenclature , has made it possible to reveal that each of these variants is widely spread among e. coli and occurs in bacteria of different o-groups .
C0007589
differentiation
C0919509
h2