During B cell maturation,immunoglobulin genes undergo rearrangement. 2.YH-->D Rearrangement H CH Cs Cy3 Cy1 Cy2b Cy2a Ca Co 5'☒☒工小H州■■■■■圈圈■3 4The section between the apposed Dregion and a V region loops out Cμ 5'3☒-2l During B cell maturation, immunoglobulin genes undergo rearrangement