Low-density lipoprotein (LDL) belongs to the lipoprotein particle family.  Its size is approximately 22 nm but since LDL particles contain a changing number of fatty acids they actually have a mass and size distribution. Each native LDL particle contains a single apolipoprotein B-100 molecule (Apo B-100, a protein with 4536 amino acid residues) that surrounds the fatty acids keeping them soluble in the aqueous environment.  The average composition of LDL is approximately 20% protein, 20% phospholipids, 40% cholesteryl esters, 10% unesterified cholesterol, and 5% triglycerides.
Low density lipoprotein physiology
Very low density lipoprotein physiology
High density lipoprotein physiology
Low density lipoprotein pathophysiology
High density lipoprotein pathophysiology
Hypolipoproteinemia pathophysiology
Low density lipoprotein epidemiology and demographics
High density lipoprotein epidemiology and demographics