Gram-positive cells constitute a major prokaryotic lineage in which cells contain peptidoglycan within their cell walls. Such cells will stain purple-violet under the Gram stain procedure. Examples include rod-shaped Bacillus and sphrerical Streptococcus cells .
- ↑ Michael Madigan, John Martinko, David Stahl, David Clark. (2012) Brock Biology of Microorganisms, Thirteenth Edition, San Francisco: Pearson. 66-67.