In human physiology there are several lipoproteins, but the most popular and influential are of the HighDensity HDL or LowDensity LDL varieties. 저밀도 지단백질 또는 LDL은 혈액에서 콜레스테롤을 운반하는 주요 화합물입니다. There are actually two kinds of LDL as well.