high density lipoprotein (hdl). carrier of \"good\" cholesterol in the blood. particle composed of apoliprotein ai wrapped around

pdb3k2s hdl high density lipoprotein good cholesterol ldl apolipoprotein lipid fat heart disease coronary atherosclerosis particle blood plasma test phospolipid bilayer double superhelix helix apoa1 cardiovascular structure peptide protein amino acid molecule polypeptide polymer atoms science scientific health molecular model