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Fig. 7. The domain deletions observed in Prs- mutant and ns mutant
leaves are consistent with a model describing the differential elaboration of
upper versus lower leaf zones during the morphological evolution of monocot
and eudicot bifacial leaves. Details are provided in the text; models are
adapted from Troll (Troll,
1955), as elaborated by Kaplan
(Kaplan, 1973).