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Developing Arabidopsis petals of the wild type (a–d) and the arc6 mutant (e–h) viewed by confocal microscopy. Red chlorophyll autofluorescence is shown as gray. The outline of the white lamina lacking fluorescing plastids is outlined by dotted lines. a and e, Stage 9; b and f, stage 10; c and g, stage 12; and d and h, mature.
