Figure 13.

Examination of living slice morphology at different developmental times supports the postnatal emergence of a distinct CA2 region. A–I: Brightfield images of P2, P3, P4, P5, P6, P7, P10, P14, and P26 living mouse hippocampal sections, respectively. The arrowhead in E–I points to the end of the mossy fiber tract in distal CA3; the thin black bar indicates the CA2/CA1 border, which is identifiable at and beyond P14. Scale bar = 200 μm in A (applies to A–I).