Table I.

Labeling density with the C2 probe on different organelles

Tissue/cell compartment	C2	GST	Ratio C2/GST	Ratio PM/X
Liver PM	4.03 ± 0.27	0.14 ± 0.002	29.1	1
Liver RER	0.96 ± 0.24	0.058 ± 0.0075	16.6	4.2
Liver mitochondria	0.82 ± 0.04	0.049 ± 0.0035	16.9	4.9
Liver mitochondria (volume)a	11 ± 1.54	0.058 ± 0.0075	16.9	NA
A431 PM	7.65 ± 0.78	0.19 ± 0.005	41.4	1
A431 RER	2.12 ± 0.21	0.090 ± 0.03	23.6	3.6
A431 Golgi	2.62	0.08	32.8	2.9
A431 Endosomeb	3.34	0	NA	2.3

Units of measure are given in gold/µm ± SEM unless otherwise indicated.

^aGold/µm²± SEM.

^bLimiting membrane only.