Table 2. Number of QD₆₀₅-labelled import sites per mitochondrion and the percentage found in clusters.

Surface area (μm2)	QDs	QDs as clusters (%)	QDs per μm2
0.78	47	82.6	60.5
0.79*	29	51.9	36.7
1.00	77	57.1	76.7
1.04	73	51.6	70.5
1.14	53	55.8	46.5
1.19*	84	72.3	70.8
1.28*	116	85.2	90.7
1.46	111	72.1	76.0
1.55	106	76.2	68.3
1.65	97	54.2	58.9
2.02*	204	80.3	100.9
2.10	158	61.8	75.3
Mean		66.8±12.7	69.3±17.5

n=12 mitochondria from 12 different tomograms. Mean is given as±s.d.

^*Denotes experiments with a different b₂Δ-DHFR_biotin and mitochondrial preparation, included to demonstrate reproducibility of results.