13510
This paper is the first report providing evidence that consumption of Et under exposure to Pb intensifies disorders in bone metabolism and that destroying of the receptor activator nuclear factor - kappa B ( RANK ) / RANK ligand / osteoprotegerin system is involved in the mechanisms of interactive action of these xenobiotics on the skeleton .
 Chemical: Pb
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Pb