E. coli bacteria. Coloured scanning electron micrograph (SEM) of Escherichia coli bacteria (pink) on a gecko's tongue. Magnification: x8000 when printed at 10 centimetres wide.

Bluebottle fly (Calliphora vomitoria) head, coloured scanning electron micrograph (SEM). Magnification: x35 when printed at 10 centimetres tall.

Dental file. Coloured scanning electron micrograph (SEM) of a dental root canal file. Magnification: x3 when printed at 10 centimetres wide.

Surgical needle, SEM

Lymphocyte white blood cell, coloured scanning electron micrograph (SEM). Its surface is covered in characteristic microvilli. Magnification: x6000 when printed at 10 centimetres wide.

Deformed sperm cell. Coloured scanning electron micrograph (SEM) of a sperm cell with multiple tails. Magnification: x5000 when printed at 10 centimetres wide.

Activated platelet. Coloured scanning electron micrograph (SEM) of an activated platelet, or thrombocyte, from peripheral blood. Magnification: x2, 500 when printed at 10 centimetres wide.

Fossil debris in chalk. Coloured scanning electron micrograph (SEM) of a fossilised fragment of a coccolithotrope skeleton. Magnification: x8000 when printed at 10 centimetres wide.

Ureter lining. Coloured scanning electron micrograph (SEM) of the surface of a squamous epithelial cell from the ureter. Magnification: x6, 500 when printed at 10 centimetres wide.

Pluripotent stem cell. Coloured scanning electron micrograph (SEM) of a pluripotent stem cell derived from a macrophage white blood cell. Magnification: x4000 when printed at 10 centimetres wide.

Cancer cell dividing. Coloured scanning electron micrograph (SEM) of a colorectal cancer cell dividing. It is in late telophase. Magnification: x4000 when printed at 10 centimetres wide.

Pluripotent stem cell. Coloured scanning electron micrograph (SEM) of a pluripotent stem cell derived from a macrophage white blood cell. Magnification: x4000 when printed at 10 centimetres wide.

Lactobacillus casei bacteria, coloured scanning electron micrograph (SEM). Magnification: x3000 when printed at 10 centimetres wide.