摘要：

The events of B-cell differentiation can be reconstructed in part through an analysis of the organisation of heavy-chain gene segments in differentiated B cells. A mouse immunoglobulin alpha heavy-chain gene is composed of at least three noncontiguous germ-line DNA segments--a VH gene segment, a JH gene segment associated with the Cmu gene segment, and the C alpha gene segment. These gene segments are joined together by two distinct types of DNA rearrangements--a V-J joining and a CH switch.

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