Patient-derived glioma stem cells treated with a PLK1 (serine/threonine-protein kinase) inhibitor and stained for nuclei (blue), alpha-tubulin (green), phospho-histone H3 (red).

Negative staining image of Bacillus thuringiensis, which produces spores and crystals in times of stress. The image was taken using transmission electron microscopy.

Scanning electron microscope image of Penta lanceolata anther (pollen bearing part of stamen).

Scanning electron microscope image of Penta lanceolata anther (pollen bearing part of the stamen).

Scanning electron microscope image of Penta lanceolata anther, with unacetolyzed pollen on the surface.

Scanning electron microscope image of Penta lanceolata stigma (receptive surface for pollen).

Nucleated erythrocytes from chicken were spread on water, the dispersed chromatin picked up on carbon-formvar grids, fixed with paraformaldehye, critical point dried and shadowed with platinum. Image...

Nucleated erythrocytes from chicken were spread on water, the dispersed chromatin picked up on carbon-formvar grids, fixed with paraformaldehye, critical point dried and shadowed with platinum. Image...

Nucleated erythrocytes from the newt Notopthahmus viridescens were spread on water, the dispersed chromatin picked up on carbon-formvar grids, fixed with paraformaldehye, critical point dried and shad...

Nucleated erythrocytes from the newt Notopthahmus viridescens were spread on water, the dispersed chromatin picked up on carbon-formvar grids, fixed with paraformaldehye, critical point dried and shad...