VDJ recombination is the process by which antibodies are generated using random DNA segments. These segments help generate massive diversity from only several dozen genes. There are 40 V's in the light chain and 51 V's in the heavy chain. There are 5 J's in the light chain and 6 J's in the heavy chain. In the heavy chain there are only 27 D's. There are no D's in the light chain. For the first recombination you have 1D region combined with 1J region. For the second recombination a single V region is recombined to the new DJ region. The first recombination and the second recombination occur on two different chromosomes. The newly recombined DNA is transcribed into pre-MRNA. This is then spliced to remove any leftover V's, D's or J's. The splicing then allows the constant region to be translated with the rest of the protein. This result in the final heavy chain of the antibody. The same process occurs to form the light chain of the antibody. But there is no D region in the light chain. There is only V's and J's as well as the constant region. The light and heavy chains come together after translation to form the full protein, which is sent out into the body to help fight infection.