1671
Serum DBP level and common single nucleotide polymorphisms ( SNPs ) at positions 432 and 436 in the GC gene , encoding DBP , were examined .
 Chemical: nucleotide
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: nucleotide