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Polyneuropathies may be classified in different ways, such as by cause, by speed of progression, or by classes of polyneuropathy, in terms of which part of the nerve cell is affected mainly: the axon, the myelin sheath, or the cell body.<unk> Of course, a more complex version of the sentence is "Polyneuropathies may be classified in different ways, such as by cause, by speed of progression, or by classes of polyneuropathy, in terms of which part of the nerve cell is affected mainly : the axon, the myelin sheath, or the cell body".