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First of all Look at this schematics:

This is the normal VDJ recombination that occurs

Now take a look at this:

See this is class switching here the constant region is also cut and that now we can form IgG instead of IgM

and too sum it all up here is a Mnemonic by rasheed - Original Post

rasheed said:
The DNA rearrangements that is responsible for the diversity of the lymphocyte receptor specificity and idiotypic antigenicity produced by the V, D, and J DNA segments.
Always forgetting which is which? Here's a mnemonic
VDJ = more genes = Bigger (heavy) chain of the immunoglobuline variable redgion and Beta chain of the TCR
VJ = less genes = light chain of the immunoglobuline = alpha chain of the TCR

Hope that helps
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