Bone Formation

A section of bone has been stained with fluorescent markers to illuminate areas of new bone formation. The row of cells at the bottom are bone-forming osteoblasts. The bright colors show where new bone has been formed.

Breath of Life

A small capillary in the lung is full of red blood cells seen in orange. The dark blue spaces are air sacs. The walls of these tiny sacs (alveoli) carry red blood cells close to the oxygen rich air sacs, which is where the red blood cells pick up oxygen and give off carbon dioxide.

Retina #5

A Human retina is seen with a single nerve cell in the middle of the image, surrounded by capillaries in black.

Human Retina

A Human retina is seen with the cones in the middle of the image, surrounded by capillaries and nerve cells, seen in black.

Sea of Skin

A cross-section of skin cells looks like an ocean scape. The brown material is keratin, a molecule give skin much of its structural character.