The invention provides monoclonal antibodies and other binding agents to human cytochrome P450 2C19 having advantageous properties, including capacity substantially to inhibit enzyme activity of human cytochrome P450 2C19 and lack of specific binding to other human cytochrome P450s. At least one fluid-restricting inlet port provides an oxidant to an inner mixing passage. Each fuse insertion opening includes a first fuse contact terminal and a second fuse contact terminal within and configured for electrical contact with an inserted fuse, and each first fuse contact terminal is coupled to the input terminal. Each of the first transparent electrode elements is arranged alternately with each of the second transparent electrode elements.