Table 1.

Wall Thickness of Fibers and Vessels in the Stems of Wild Type and fra3 Mutant (μm)

Sample	Fiber Cells	Vessels
Wild type	3.54 ± 0.25	2.23 ± 0.18
fra3	2.11 ± 0.45	1.64 ± 0.21

The wall thickness was determined from transmission electron microscope micrographs of fibers and vessels. Data are means ± se from 25 cells.