Fig. 5. Cell division patterns in tan1 vein formation. Cell divisions present in the formation of wild-type minor veins (A,B) and tan1 minor veins (C,D), where divisions appear much later than in comparable wild-type veins. Arrows indicate procambial strands in wild-type (A,B) and late divisions within procambial strands in the tan1 mutant (C,D). Bar, 10 µm.