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. 2008 May 21;3(5):e2245. doi: 10.1371/journal.pone.0002245

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van der Veen 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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Graphs show the percentage of time spent in pup licking, nursing posture and nest reorganizing activity with C57 pups (left panels) and DBA pups (right panels) averaged over 4 postnatal days (PD 2, 4, 6 and 9). Behavior of the reference mothers (bio mothers) is shown as horizontal hatched bands. Bars represent mean±SEM. AKR mothers (white bars) n = 9 dams for each pup strain. C3H mothers (black bars) n = 7 dams for each pup strain. Bio mothers (hatched bands) n = 15 for C57 dams and n = 8 for DBA dams. * p<0.05, ** p<0.01 and *** p<0.001 compared to C3H mothers. # p<0.05, ## p<0.01 and ### p<0.001 compared to bio mothers.