24.3 Immunoglobulin genes are assembled from their parts in lymphocytes Figure 24.7 Heavy genes D-J joining ↓ are assembled y sequent Joining D junction reactions First a d V-D joint segment is Lymphocyte DNA MA joined to a J segment: then V-D jun a v gene Actual strucure of c gene is interupted segment IS Joined to the D segment IntrorHingentron CH2 Intron 消当Figure 24.7 Heavy genes are assembled by sequential joining reactions. First a D segment is joined to a J segment; then a V gene segment is joined to the D segment. 24.3 Immunoglobulin genes are assembled from their parts in lymphocytes