Nerve bundle cross section:  Axons (orange) are wrapped in myelin (purple)

A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Melanoma Cell; ion-abrasion SEM. Here, the nucleus is the dark sphere, engulfed by mitochondria (in pink) and endoplasmic reticulum (in gold).

A melanoma cell viewed with imaging with Ion-Abrasion SEM. Credit : Donald Bliss and Sriram Subramaniam, National Library of Medicine, NIH

Leukaemia blood cells. SEM of red blood cells (orange) and B lymphocyte white blood cells (white) from a patient with acute lymphoblastic leukaemia

SEM of red blood cells (orange) and B lymphocyte white blood cells (white) from a patient with acute lymphoblastic leukaemia

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