Table 1.

Alkaline phosphatase (ALP) specific activity of MVs from resting zone chondrocytes.

	ALP activity (µmol Pi/mg protein/min) (mean ± s.e.m.)	Fold enrichment
Total cell lysate	4.04 ± 0.45c,d	1
Mitochondria	4.67 ± 2.58d	1.16
Plasma membrane	8.00 ± 1.00d,e	1.98
MVs	16.65 ± 3.79a,b,c,e	4.12
Pellet from culture medium	2.33 ± 0.43c,d	0.57

Note: ^ap < 0.05 compared with total cell lysate; ^bp < 0.05 compared with mitochondria; ^cp < 0.05 compared with plasma membrane; ^dp < 0.05 compared with MVs; ^ep < 0.05 compared with pellet from culture medium; n = 5 or 6. All the comparisons were done within the same cell type. (^a–eBased on one way ANOVA). The enrichment folds compared with total cell lysate are presented on the right.