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O1 localizes to phragmoplasts. Immunofluorescence detection of microtubules and O1 in wild-type cells (A to C). All samples are from the division zone of developing leaf 4. O1 is detected in phragmoplasts of symmetrically dividing cells (A), asymmetrically dividing stomatal lineage cells that will form GMCs (B), and asymmetrically dividing SMCs (C). Yellow arrowheads indicate phragmoplast ends. Scale bar, 10 µm.
