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Active transport and diffusion of fluorescently labeled tubulin proteins. Note that tubulin diffused much more extensively than the neurofilament shown in Fig. 1. The images are arranged as in Fig. 1: A and E, bright-field; B and F, fluorescent image soon after injection; C and G, 3 hr later; and D and H, trace of fluorescence intensity. (The scale bar in E is 250 μm for all images; length scales of the intensity traces are the same as Fig. 1.)
