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The mammalian TRP (transient receptor potential) family consists of six main subfamilies that include 28 ion channels that function as cellular sensors of various phenomena, including changes in temperature, osmolarity, pH, membrane stretch, and various second messenger pathways. All of the TRP channels are permeable to monovalent cations, and most are also permeable to calcium ions. There are strong indications that TRP channels are involved in many diseases. This review highlights some TRP "suspects" for which a role in disease can be anticipated. An understanding of the genetics of disease may lead to the development of targeted new therapies.