cell wall https://github.com/geneontology/go-ontology/issues/21669 Not to be used for manual annotation. Please choose a more specific term: for bacteria, annotate to GO:0009274; peptidoglycan-based cell wall, for plants: annotate to GO:0009505 ; plant-type cell wall, for fungi: GO:0009277 ; fungal-type cell wall, and for archae, use GO:0030115 S-layer (see PMID:31214995). cellular_component Wikipedia:Cell_wall GO:0005618 The rigid or semi-rigid envelope lying outside the cell membrane of plant, fungal, most prokaryotic cells and some protozoan parasites, maintaining their shape and protecting them from osmotic lysis. In plants it is made of cellulose and, often, lignin; in fungi it is composed largely of polysaccharides; in bacteria it is composed of peptidoglycan; in protozoan parasites such as Giardia species, it's made of carbohydrates and proteins. external encapsulating structure