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| Gas vesicles in a freeze-fractured cell of Prosthecomicrobium pneumaticum showing the straight-sided cone, the ribs in the cone and cylinder, and the prominent central rib where the two identical halves of the structure may be joined back-to-back. Reproduced from reference Walsby, 1978, with permission from the publisher. (Micrograph by D. Branton and A. E. Walsby.) Magnification, x210,000. |
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