Fibers  - Fibers are vertically aligned cells that have thick, tough walls.  Most fiber cells live for less than a year.  Dead fiber cells provide strong mechanical support for trees.  Fibers have thick cell walls. The secondary wall is divided into an S1, S2, and S3 layer.  The S2 layer in the middle is the thickest.  The S2 layer is the major site for bound water.  Dead fibers and tissues are what holds the symplast in place.  Note:  All parts of a tree are born alive.

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