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Prof. Williams’ primary experimental organism is Arabidopsis thaliana.

Arabidopsis plants in the growth chamber		Arabidopsis plants up close and personal
A cross-section of main root stained with Toluidine Blue		A developing lateral root at the four-cell stage, viewed with Nomarski-DIC microscopy
Vesicle movement in the root hairs of wild type Arabidopsis. For ease of comparison, we have circled a single vesicle for the first half of each movie.		Vesicle movement in the root hairs of a sac9 mutant. Notice that the rate of movement of vesicles is much higher in the sac9 mutant.