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FAAH(-/-) mice display a phenotypic reduction in compound 48/80-induced scratching. Graph shows a reduced response in mice lacking FAAH enzyme activity (checkered bars) bred onto either C57BL/6 or DBA/1 background strains. Significance was determined between genotypes for each strain using Student's t test; ⋆, p < 0.05 versus respective FAAH(+/+) group (Tukey's post hoc test). n = 8 to 12 mice/group.
