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Spatial learning in mutant mice lacking OFQ/N (−/−) and their wild-type (+/+) littermates in the Morris water maze paradigm. Data are expressed as mean latency ± SEM for each session (each session consisting of four individual trials). ○, OFQ/N+/+, n = 11; ■, OFQ/N−/−, n = 19. No significant difference between genotypes was detected.
