File:Plaque assay macro.jpg

Macroscopic photograph of viral plaque formation. Vero cells, which grew confluently on the bottom of the plastic plate (1.5 cm diameter), were infected with herpes simplex virus (approximately 75 plaque forming unit), and then cultured over night to make viral plaque. Living cells were stained with crystal violet. The viral plaques, each was from one virion, remained transparent. uploaded from Wikiedia commons I, the author of this work, hereby publish it under the following licenses: Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".