18354
We examined whether the oxytocin receptor gene ( OXTR ) single nucleotide polymorphism ( SNP ) rs53576 genotype buffers the combined impact of negative social environments ( e . g . , interpersonal conflict / constraint ) and economic stress on post - traumatic stress ( PTS ) symptoms and impaired daily functioning following collective stress ( September 11th terrorist attacks ) .
 Chemical: oxytocin; 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: oxytocin; Chemical: nucleotide