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Abstract:
Switching of an Abelson virus-transformed mouse lymphoid cell line from immunoglobulin μ to γ2b heavy-chain synthesis in vitro is accompanied by loss of DNA sequences between the JH and Cγ2b gene segments, and thus cannot be explained by differential RNA processing. The light-chain loci of both μ- and γ2b-producing cell clones are in the embryonic configuration, which indicates that class switching can occur in pre-B cells.