High-density lipoproteins (HDL) mature in the plasma by acquiring phospholipids extruded from shrinking triglyceride-rich particles, facilitated by phospholipid transfer protein.

“the only lipoprotein that is not made in the liver or the intestine but grows itself matures itself in the plasma high density lipoproteins you couldn't change a baby apo a1 which is a structural protein of an HDL into a big fat mature large HDL if you weren't supplying it with what phospholipids where would an HDL give phospholipids as these big triglyceride rich particles shrink and extrude them phospholipid transfer proteins is here little baby HDL here's your phospholipids B and they can mature into its anthropomorphizing these things little babies HDL it helps”