Most plasmodesmata contain a narrow cylindrical structure, called the desmotubule, which runs through the channel and connects the smooth ER of the two adjacent cells.

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Plasmodesmata are microscopic channels that traverse the cell walls of plant cells and some algal cells, enabling transport and communication between them. The desmotubule is a narrow, cylindrical structure within the plasmodesmata that is derived from the endoplasmic reticulum, thus connecting the smooth ER of adjacent cells.

Most Plasmodesmata Contain a Narrow Cylindrical Structure, Called the Desmotubule