| http://www.w3.org/ns/prov#value | - Counter electrodes are optionally provided, e.g. integrated in the layer comprising the working electrodes or provided as a component of a second layer comprising the cassette. [0210] In a preferred embodiment, a cassette or apparatus of the invention comprises a sample port and/or reservoir and one or more channels for sample delivery onto the sensor element(s) present in the cassette.
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