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