serum lipoproteins were separated by sequential ultracentrifugation into very low density lipoproteins [ density ( d ) less than 1.006 g/ml ] , low density lipoproteins ( ldl ; d 1.006-1.063 g/ml ) and high density lipoproteins ( hdl ; d 1.063-1.21 g/ml ) .
C0023820
lipoproteins
C0023825
very low