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To evaluate the physiologic plausibility of these claims, we compared the abundance of the VDR mRNA in peripheral blood mononuclear cells ( PBMCs ) between different VDR genotypes using a quantitative reverse transcribed polymerase chain reaction-based method .
 VDR genotypes, PBMCs, VDR mRNA, peripheral blood mononuclear cells, VDR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 VDR genotypes, PBMCs, VDR mRNA, peripheral blood mononuclear cells, VDR