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Small apolar substitutions ( 11 alpha-methyl, 11 alpha-fluoromethyl ) did not markedly decrease the affinity for the vitamin D receptor , but larger ( 11 alpha-chloromethyl or 11 alpha- or 11 beta-phenyl ) or more polar substitutions ( 11 alpha-hydroxymethyl, 11 alpha-(2-hydroxyethyl ] decreased the affinity to less than 5% of that of 1 alpha,25-OH)2D3 .
 protein: vitamin D receptor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: vitamin D receptor