Microtubles exist in all living things, except bacteria and blue-green algae. Within cells, they maintain cell shape and produce movement of the cells themselves.
International Science Film Collection, Audio Visual Services, Pennsylvania State University, 201 Carnegie Building, 1127 Fox Hill Rd., University Park, PA 16802, Toll-free: 800-826-0132, URL: http://www.psu.edu
Running time 25 minutes.
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