Glial cells, confocal light micrograph Mitochondria, TEM Retina blood vessels and nerve cells Mitochondrion, TEM Cardiac muscle, TEM Cardiac muscle and capillary, TEM Myelination of nerve fibres, TEM Small intestine villi, section Cardiac muscle, TEM HeLa cells, light micrograph Nerve fibre node, TEM Myelinated nerve, TEM Tongue bacteria, TEM