The pre-prophase band is a cortical array of actin and microtubules that forms in higher plants cells between late G2 and early mitosis. Although the PPB is disassembled early in mitosis, it plays an essential role in the determination of the division plane. Some PPB components remain at the cell cortex as landmark proteins during cytokinesis and direct phragmoplast orientation as it expands toward the cortex. Presumably, plus ends of phragmoplast microtubules contact the cortex and interact with landmark proteins. Even after displacement of the phragmoplast toward a cell end, phragmoplast microtubules reestablish contacts with the site previously marked by the PPB and reposition the growing cell plate. The mechanisms of PPB formation, function, and disassembly are not clear. Plant cells lack discrete centrosomes and during interphase nucleate microtubules from different surfaces. It has been suggested that proteins involved in microtubule dynamics stabilize...
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