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Plasma membranes of cultured cells contain high affinity receptors for high density lipoprotein ( HDL ) that appear to mediate removal of excess intracellular cholesterol .
 high density lipoprotein, HDL
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 high density lipoprotein, HDL