Table 1.

Proposed functional grouping of Rab proteins based on Golgi ribbon phenotype

	Golgi ribbon phenotype produced by Rab inactivation or activation
	Inactivation (Depletion, GDP-locked/no nucleotide form or GAP overexpression)	Activation (GTP-locked form or wild-type overexpression)
Class 1A	Redistribution of Golgi enzymes to the ER	Normal
Class 1B	Fragmented Golgi ribbon	Normal
Class 2	Normal	Redistribution of Golgi enzymes to the ER