Bone marrow (colorized view 1)
1. Trabeculae of bone
2. Megakaryocytes
3. Red blood cells in sinusoid
4. Adipose cells
This slide shows a section of red bone marrow within cancellous (spongy) bone taken with a phase-contrast microscope. Note how the technique has given the image bright (artificial) colors as well as a three-dimensional appearance!