1487
DNA from peripheral nuclear blood cells was genotyped for 5 - HTTLPR using standard polymerase chain reaction methods . A significant group effect was observed only on memory function tasks ( p = 0 . 04 ) but not on reaction times ( p = 0 . 61 ) or attention / executive functioning ( p = 0 . 59 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 None