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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
Large LDL particles measure around 27 nm in diameter, while small LDL particles measure around 24 nm. That modest size difference of about 3 nm accounts for widely divergent behavior. The configurations of the two complex particles differ, with the main protein of LDL particles, apoprotein B, assuming a unique shape when the particle is downsized.