2914
Tritiated 1 , 24 , 25 - trihydroxyvitamin D3 was synthesized biologically and used as tracer to monitor the recovery of endogenous metabolite during isolation from serum .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None