4
An association of an SNP in the DPP6 ( dipeptidyl peptidase - like protein - 6 ) gene , rs6977820 , the most promising association identified by the screen , was significant in the replication sample ( allelic P = 0 . 008 in the replication sample , allelic P = 4 . 6 x 10 ( - 6 ) , odds ratio 2 . 32 in the combined sample ) .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None