Figure 4.

OM images of HEK 293T cells seeded on PPy substrate covered with aligned CNF. (a) Schematic illustration of the NFES-aligned CNF of different positioning densities. (b, c) Approximately 50 fibers/mm2 (20 μm), (d, e) approximately 10 fibers/mm2 (100 μm), and (f, g) cells seeded on nanofiber-free solid substrate. The smaller images at the right upper corner are shown to reveal the orientation of the cells (not on scale). The scale bars are 100 μm.

Fuh et al. Nanoscale Research Letters 2013 8:97   doi:10.1186/1556-276X-8-97
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