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Fig. 2. ifa1 mutants produce additional spikelets and extra florets. (A) A pedicellate and sessile spikelet from a normal tassel. (B) A male spikelet showing two florets within a pair of glumes. (C) In ifa1 mutants, more than two florets are observed in a spikelet. (D) Three or more spikelets form instead of a pair of spikelets. g, glume; f, floret; sp, spikelet; sp*, extra spikelet, p, pedicel.