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Cover picture: A three-dimensional confocal image
from rat parietal cortex layer V. Nuclei are in green
(Sytox). The image was taken from an animal that
was given two identical behavioral exploration
sessions separated by 60 min before being killed. The
image shows combined immunohistochemistry and in
situ hybridization staining for Arc protein and Arc
mRNA, respectively. Arc protein (in blue) was induced
by the first exploration session, and Arc mRNA (in red
or in pink when colocalized with the protein) was
induced by the second exploration session. Note the
high colocalization of Arc mRNA and its protein,
suggesting that the same neural ensemble was (25X
magnification). For details, see the article by Ramirez-Amaya et al. in the February 16, 2005 issue (pages 1761-1768).
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