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Fig. 6. Model for activation of AP3 expression. Initiation of AP3 expression in the flower depends on multiple regulatory cascades. LFY appears to act through at least three pathways; one pathway is direct, one pathway requires the function of AP1; another indirect pathway depends on an as yet unidentified factor (X). In addition, a LFY-independent mechanism requiring unknown factor(s) (Y) functions in certain tissues to promote AP3 transcription.





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