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Phase-contrast photomicrographs showing the effects of (a) NGF, (b) G. lucidum, (c) L. rhinocerotis, (d) P. giganteus, (e) G. frondosa, and (f) C. militaris on the morphology of differentiating N2a cells after 48 h. Untreated cells serve as control (g) and only contained 5% FBS as vehicle. Arrows indicate typical neurites of N2a. Scale bar represents 20 μm. Photomicrographs of representative microscope fields were taken with a 20× objective.
