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Conventions The following abbreviations are used frequently throughout the monograph: CIDP chronic inflammatory demyelinating polyradiculoneuropathy EM electron microscopy GBS Guόlain-Barrι Syndrome H&E hematoxylin and eosin HMSN hereditary motor and sensory neuropathy LCA leukocyte common antigen LM light microscopy MF myelinated fiber NMSC non-myelinating Schwann cell OB onion bulb PAS periodic acid-Schiff PNS peripheral nervous system SC Schwann cell ScSu Schwann cell subunit UF unmyelinated fiber The following conventions apply to all figures: • Paraffin-embedded tissue is histostained with H&E unless stated otherwise. Semi-thin (plastic-embedded) tissue is always stained with Toluidine Blue. • Magnifications are provided for electron micrographs only. • Where appropriate, axons are labeled with "a." • ΑΠ iUustrations are from sural nerve biopsies unless otherwise stated.