1810
A significant linkage disequilibrium was found between the - 318C / T and + 49A / G polymorphisms in the CTLA - 4 gene ( D ' = 0 . 997 , r ( 2 ) = 0 . 027 , P = 0 . 0002 ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None