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Working Model for EXB1 Function.
EXB1 controls plant branching by affecting both AM initiation and bud activities. EXB1 positively regulates RAX1, RAX2, and RAX3 and thus upregulates the downstream genes CUC2 and ROX to control AM formation. EXB1 also regulates auxin pathways to affect both AM initiation and bud outgrowth.
