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The new cell wall is initiated in the center of the cell after chromosome separation in anaphase, and expands laterally until it fuses with the parental cell wall at a predetermined site.

Click image to see oscillations in cytoplasmic calcium at the tip of a growing pollen tube.

The movie shows animated pseudocolor ratio images of a growing pollen tube loaded with the calcium-sensitive dye fura-2 dextran. High cytoplasmic calcium is indicated by red, low by blue.