11057
The concentration of the VDR mRNA , corrected for the number of monocytes , was similar among the three genotype groups, as were the other variables examined: serum calcitriol , serum osteocalcin , and vertebral and hip bone density .
 monocytes, serum calcitriol, VDR mRNA, serum osteocalcin
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:
 monocytes, serum calcitriol, VDR mRNA, serum osteocalcin