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. 2011 Apr 28;6(4):e19218. doi: 10.1371/journal.pone.0019218

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Chourbaji et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Behavioral strain differences between C57BL/6N and Balb/c mothers with a glucocorticoid receptor wildtype (GR +/+) or a heterozygous deletion (GR +/−) are exemplarily presented for four different behavioral measures: (A) ‘licking/grooming’, (B) ‘passive nursing’, (C) ‘self-grooming out of nest’ and (D) ‘climbing/digging’. While strains were found to differ significantly in all four measures, GR genotype did not affect the behavior. Moreover, a significant strain-by-genotype-interaction was found with respect to ‘licking/grooming’. While C57BL/6N +/+ dams spent more time ‘licking/grooming’ than Balb/c mothers of both GR genotypes, no difference was found between C57BL/6N +/− mothers and Balb/c dams. Data are presented as untransformed means ± standard error of the mean, * p<0.05, ** p<0.01.