During B cell maturation,immunoglobulin genes undergo rearrangement. 1.D-->JH Rearrangement H D JH Cy3 Cy1 Cy2b Cy2a Ca 5'32☒什H州■■■ -3 A section containing a number of D regions and a number of Jregions loops out H Cs 5'☒2☒☐中H册 During B cell maturation, immunoglobulin genes undergo rearrangement