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Models for how type H3 RSSs came to be associated with Vh genes of group B. Two models are proposed to explain the presence of the RSS type H3 within group B: the first involves an unequal crossing over (model I), and the second postulates a germline site-specific V(D)J recombination event (model II). Type H2 and H3 RSSs are indicated by solid and open triangles, respectively.
