Ordered rearrangement of B-lymphocyte variable gene regions of the IMMUNOGLOBULIN HEAVY CHAINS, thereby contributing to antibody diversity. It occurs during the first stage of differentiation of the IMMATURE B-LYMPHOCYTES.

Synonyms: B-Lymphocyte Heavy Chain Gene Rearrangement, B Lymphocyte Heavy Chain Gene Rearrangement, B Cell Heavy Chain Gene Rearrangement, Gene Rearrangement, B-Lymphocyte, Heavy Chain, B Lymphocyte Mu Chain Gene Rearrangement, B Cell Mu Chain Gene Rearrangement, B-Cell Heavy Chain Gene Rearrangement, B-Lymphocyte Mu Chain Gene Rearrangement