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Q J Med 2004; 97: 109-110
© Association of Physicians 2004; all rights reserved.

Biologic

Hearing the sermons in stones

Colin Berry

The first 10% of the full text of this article appears below.

In order to stay upright, or to lie down carefully, we have developed a well-defined system to ensure that we are aware of our position and orientation in three dimensions. This system depends on extracellular masses of proteins interleaved with inorganic crystals of calcium carbonate, lying over sensory hair bundles that are deflected by movements in the mass. There is a single large mass in the genus Pisces, the otolith, which rests above the gravity-sensing organ (the macula). In all other vertebrates (mammals, . . . [Full Text of this Article]


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