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This is a 3µm longitudinal slice (#62) of the rat E10 egg cylinder that cuts through most of the right side and into a very small midline area posteriorly.  The heart primordium is no longer in this slice.  The surface ectoderm is in the area where the brain was located in slice #59.  The neuroepithelium of the spinal cord is over a primitive streak in a small posterior area.