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Fig. 8. A model of rgo1 and ids1 combinatorial control of spikelet and spikelet pair meristem identity. (A) During wild-type development the inflorescence meristem (IM) produces many spikelet pair meristems (SPM). Each SPM initiates one spikelet meristem (SM) and converts into a SM. Each SM initiates one floret meristem (FM) and converts into a FM. (B) rgo1 mutants are similar to wild type except that each SM initiates two FMs before converting into an FM. (C) ids1 mutants are similar to rgo1 except that each SM can initiate multiple FMs before converting into an FM. (D) rgo1; ids1 double mutants exhibit a synergistic phenotype. SPMs initiate multiple SMs. SMs initiate multiple SMs in a reiterative fashion and can eventually produce FMs. All FMs initiate floral organs. Black and grey arrows represent meristem initiation. Blue arrows are meristem identity conversions.