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Model for ABA and VP1 regulation of seed maturation. Vp1 and ABI5 expression is initiated by hypothetical unknown seed factors and then further activated by ABA. VP1, ABI5, and ABA synergistically regulate seed maturation. At the same time, VP1 and ABI5 feed back to further up-regulate their own expression, perhaps indirectly in the case of Vp1 (modified from Casaretto and Ho, 2005).
