All

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 G04 Biological Phenomena, Cell Phenomena, and Immunity D001687 +
  G04.610 Immunity D007109 +
   G04.610.626 Immunogenetics D007125 +
    G04.610.626.320 Gene Rearrangement, B-Lymphocyte D015322 +
     G04.610.626.320.501 Gene Rearrangement, B-Lymphocyte, Heavy Chain D015326 +
       G04.610.626.320.501.450 Immunoglobulin Class Switching D017578 
 G05 Genetic Processes D039361 +
  G05.330 Gene Rearrangement D015321 +
   G05.330.401 Gene Rearrangement, B-Lymphocyte D015322 +
    G05.330.401.501 Gene Rearrangement, B-Lymphocyte, Heavy Chain D015326 +
      G05.330.401.501.450 Immunoglobulin Class Switching D017578