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Fig. 1. The elongated and multiple-arrayed dividing chloroplasts in developing seedlings of Arabidopsis arc11. Chloroplasts in primary leaf petioles of 7-day light-grown wild-type (WT, Ler) and arc11 seedlings were observed by CLSM. (A) Imaging of chlorophyll autofluorescence of WT and the arc11. (B) Differential interference contrast (DIC)-single optical sections of dividing chloroplasts in WT (inset) and arc11. Membrane constriction sites of dividing chloroplasts are indicated by black arrowheads. Mini-chloroplasts (
2 µm in diameter) in a population of expanding and dividing chloroplasts in arc11 are indicated by white arrowheads. Bars, 10 µm.