The portion of the myelin sheath in which layers of cell membrane are tightly juxtaposed, completely excluding cytoplasm. The juxtaposed cytoplasmic surfaces form the major dense line, while the juxtaposed extracellular surfaces form the interperiod line visible in electron micrographs. (Gene Ontology, GO_0043218)
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15 proteins localized to the compact myelin cellular component from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset.