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LEVEL 8 is a more lateral slice of the dorsal and ventral hippocampus in the same P40 rat.  The dorsal and ventral parts of the internal molecular layer are beginning to fuse around the most lateral part of the thalamus.  The same thing is happening in Level 8 at P10 and P40, but there is progressively more separation between the internal limbs with increasing age.  This P40 rat has the greatest distance.

In the dorsal dentate gyrus, the entire granular layer contains a continuous deep layer of labeled cells from one end to the other.

The ventral dentate gyrus has a much longer internal limb than it had at Level 7.  It has lots of labeled granule cells beneath a thin and feathered layer of unlabeled cells.  More unlabeled cells are in the external limb, but fewer than are visible in the P20 rat at Level 8.  The external limb (more prenatal granule cells) to internal limb (more postnatal cells) neurogenetic gradient in the granular layer is becoming less prominent.