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An intronic SNP ( rs6988229 ) in the collagen ( COL22A1 ) locus also provided strong replication signals ( P = 8 . 51 x 10 ( - 6 ) ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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