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The presynaptic active zones in 3 different types of fibers in frog rana pipiens muscle

, : The presynaptic active zones in 3 different types of fibers in frog rana pipiens muscle. Proceedings of the Royal Society of London Series B Biological Sciences 221(1224): 369-374

Presynaptic active zones were studied in slow, fast and intermediate types of frog muscle fibers in freeze-fracture replicas. In fast fibers, the double rows of paired particles are present on active zone ridges perpendicular to the longitudinal axis of the nerve, whereas in slow fibers active zone ridges are rudimentary or absent and double rows of particles occur in all directions, mostly paired, sometimes single. In the intermediate type of muscle fibers both types of active zone deployment coexist on a single muscle fiber.

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