| http://www.w3.org/ns/prov#value | - The electrodes (142) may be made of a conducting ceramic, conducting polymer, and/or a noble or refractory metal, such as gold, silver, platinum, iridium, tantalum, titanium, titanium nitride, niobium or their alloys that, e.g., minimize corrosion, electrolysis, and damage the surrounding tissues.
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