CMMARY Flagellar antigei\ of F1'61'10 n!g!"o4^ti'ci!s \\, as solubilized and some of its properties \\, ere studied. It \\, as shown that flagellin of Vibrio a!gi', lob, tic!, s consisted of a single protein, \\Ith similar Immunological properties to that of U-11, one of the antigenic subunits of Hagelliit of Fibi'10 lard/incmo!y/IC"s. The amino acid compositions of U-11 and the flagellin of '16/10 a!gillob^11'CMs \\, ere compared. Thc contents of most amino acids \\, ere similar, but

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... s in the contents of several amino acids were observed. The physicochemical properties of U-11 and thc Ragel-11n of Fibi'10 n!gi', 1041/1'c!, s, sucll as the S \, alue and A's, IA2, , ratio \\, ere similar. TITe presence of the same Hugellar antigen in other strains of Fibi'10 rr!gillob, /ICw$ wars demonstrated.