There are three kinds of gene segments here called V, D and J. For the heavy chain of the antibody, humans usually have around 130 different V segments, 27 D segments and 6 J segments.

这里有三种基因片段， 分别称为V、D和J。对于抗体的重链， 人类通常有大约130个不同的V片段、27个D片段和6个J片段。