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Fig. 4. Model of regulatory relationships between KNOX1 genes, leaf genes
and hormones in vegetative apices. Genes are shown in red and hormones are
shown in blue. Arrows indicate positive regulation and lines with blunt ends
indicate negative regulation. Light blue arrows show the path of polar auxin
transport. The dotted line designates the incipient leaf primordium. STM,
SHOOT MERISTEMLESS; AS1/AS2, ASYMETRIC
LEAVES1/2; BP, BREVIPEDICELLUS; KNAT2,
KNOTTED-LIKE2 in A. thaliana; LOB, LATERAL ORGAN
BOUDARIES; CK, cytokinin; GA, gibberellic acid.