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The channelome, sometimes "ion channelome", is an expression used to describe the complete set of ion channels expressed in a biological tissue or organism. It is analogous to the genome, the metabolome (describing metabolites), the proteome (describing general protein expression), the microbiome etc. Characterization of the ion channelome can be performed by a wide variety of ion channel studying techniques ("channelomics") including patch clamp electrophysiology, PCR and immunohistochemistry.