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Fig. 2. Phase-contrast light micrographs showing the alignment processes of osteoblasts. Cells were subjected to 10 V/cm for 80 minutes. A, cells resting; B, after 30 minutes; C, 60 minutes; D, 100 minutes; E, 150 minutes; and F, 180 minutes of exposure. Signs (+/–) show the polarity of the field.