Table 2.

Quantitative Analysis of MVB Structural Features in Embryos

	MVB Diameter (in nm)	Number of Lumenal Vesicles/Section	Percentage of Lumenal Vesicles Attached to MVB Membrane	Diameter of Lumenal Vesicles (in nm)
chmp1a chmp1b	276.2 (±65.6) *	1.0 * (±1.2)	53% *	35.6 (±7.3)
	n = 64			n = 71
Control	346.2 (±57) *	5.6 * (±3.5)	10.7% *	35.0 (±7.5)
	n = 40			n = 182

Only those endosomes labeled with the anti-RABF2A/RHA1 antibody were used for this analysis. Asterisks indicate that the difference between control and double mutant is significant at P < 0.01