Colour-enhanced transmission electron micrograph showing a transverse section through a nerve fibre in the corneal stroma. The Schwann cell that wraps around the nerve cells contains a nucleus, mitochondria and some rough endoplasmic reticulum. The nerve is passing through the layers of stromal lamellae - layers of collagen fibrils lying across each other at different angles thus appearing as dots or lines depending on the plane of section. The field is approximately 11 microns across.
This unusual image is a photomicrograph of a three-day-old zebrafish retina. This is a lateral view of the whole zebrafish eye, (analogous to looking directly into ones eye from the front). The image shows the lens in the centre surrounded by retinal stem cells in red and differentiating neurons in purple. The symmetrical nature of this image was achieved by reflecting the top half of the image across the origin. This is representative of true data as the zebrafish retina is very symmetrical photoreceptor organ.