Table 2.

Marker enzyme activities in the activating fractions of the experiment shown in Fig. 5

Fraction	Marker enzymes
	Plasma membrane, 5′-Nucleotidase, μMol Pi/30 min	Endoplasmic reticulum, NADH cytochrome c reductase, μmol NADH/30 min	Golgi membranes, UDP galactosyl transferase, nmol galactosyl × 105/16 h
Crude plasma membranes	0.216	46	9.8
Percoll-purified plasma membranes	0.487	0	1.3
Golgi-enriched membranes	0.299	28	12.8
Cytosol	0.085	0	9.3