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Noun hdl has 1 sense
high-density lipoprotein, HDL, alpha-lipoprotein - a lipoprotein that transports cholesterol in the blood; composed of a high proportion of protein and relatively little cholesterol; high levels are thought to be associated with decreased risk of coronary heart disease and atherosclerosis--1 is a kind of lipoprotein
 --1 has substances: HDL cholesterol
 
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