Somatic antigen From Wikipedia the free encyclopedia Type of antigen A somatic antigen is an antigen located in the cell wall of a gram-positive or gram-negative bacterium.[1] See also[edit] Lipopolysaccharide References[edit] ^ "somatic antigen". TheFreeDictionary.com. Retrieved 7 May 2019. This bacteria-related article is a stub. You can help Wikipedia by expanding it.vte