Tip growth
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Tip growth is an extreme form of polarised growth of living cells that results in an elongated cylindrical cell morphology with a rounded tip at which the growth activity takes place. Tip growth occurs in algae (e.g., Acetabularia acetabulum), fungi (hyphae) and plants (e.g. root hairs and pollen tubes).
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Tip growth is a process that has many similarities in diverse walled cells such as pollen tubes, root hairs, and hyphae.