in incubations containing mixtures of lipoproteins isolated either from humans or from rats , the addition of human lipoproteins-free serum ( the dialysed 1.25 g/ml infranatant solution ) was more than five times more effective than that of the rat in promoting the transfer of esterified [ 3h ] cholesterol from high density lipoproteins to very low density lipoproteins , regardless of the species origin of the lipoproteins , implying the existence of an esterified cholesterol transferring factor of much greater activity in human than in rat serum .
C0023825
very low density lipoproteins
C0023820
lipoproteins