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E12 to E13 Survival Archived Images-Sagittal

The following images are from a sagittally-sectioned specimen of an E13 rat embryo exposed to tritiated thymidine on E12–24 hr survival.  This embryo was embedded in methacrylate.  Note the heavily-labeled cells just outside the germinal zones in the brain and spinal cord.  Methacrylate causes excess background noise, but the heavily-labeled migrating cells still stand out.  Many of these cells are postmitotic young neurons.