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The current paradigm of the LD structure. (A) Conventional electron microscopy. LDs are observed as spherical structures with no internal structure and are not delimited by the conventional unit membrane. Bar, 200 nm. (B) Cryoelectron microscopy of the isolated LD. The LD surface is seen as a single electron-dense line, which is probably derived from a row of phosphorus atoms in the phospholipid monolayer. Bar, 20 nm.
