Abstract
Evidence is presented that the phenotype of the rat T helper cells is stable after priming and boosting with a hapten‐carrier conjugate and that the phenotype is W3/25+, MRC OX‐22, MRC OX‐8. Data are also presented that demonstrate the presence of doubly marked, W3/25+, MRC OX‐8+, cells in the spleens of rats primed 1 week previously.

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