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Rat CCs form stable electrical contact on metallic MEAs. Photomicrograph of rat CCs plated on a multielectrode array (MEA1060, MCS, Reutlingen, Germany) for simultaneous recording of eAPs from 60 metallic microelectrodes (diameter: 30 μm). Insets: higher magnification of a MEA electrode (black) in contact with two visible chromaffin cells of different size. The cell-microelectrode contact region allows to record spontaneous eAPs of various forms for minutes or hours at 37 °C
