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Open field behavior of four different rat strains. The means and standard errors of the means (SEMs) of the BN, Lewis, F344, and WKY strains across 5 successive days of testing are depicted for time spent in the corners of the OF (panel a), total number of line crossings (panel b), number of rearings and leanings (panel c), and number of grooming bouts (panel d). Note: the mean time spent in the center of the open field is also depicted in panel a (highlighted grey).
