Antigenic Relationships in the Genus Tetrahymena

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Abstract
Six strains of the ciliated protozoan, T. geleii, and 2 strains of T. vorax were studied by cross-adsorption techniques for antigenic relationships. 5 of the strains of T. geleii were found to possess qualitatively identical antigens, each differing, however, quantitatively. One strain (strain T) of T. geleii differed from all of the others in the possession of additional antigenic structure. The absence of cross reactions between the 2 spp. showed them to be markedly different antigenically. The serol. studies confirm the earlier biochem. studies in proving that a variation has occurred between T. geleii T (parent) and T. geleii T-P (daughter) and the evidence seems to support the view that strain T has varied by gaining antigens.