Figure 3.

A fraction of Arabidopsis α-tubulin is associated with membranes. Membrane preparations from Arabidopsis roots indicate that a fraction of α-tubulin is associated with membranes. S5 = soluble fraction after centrifugation at 5,000 × g, S100 = soluble fraction after centrifugation at 100,000 × g, P100 = insoluble (membrane) fraction after centrifugation at 100,000 × g. α-tubulin has a mass of approximately 49 kDa.