part of cis-Golgi network membrane lumenal side of membrane lumenal side of cis-Golgi network membrane https://github.com/geneontology/go-ontology/issues/30389 https://github.com/geneontology/go-ontology/issues/31515 cellular_component The leaflet of the cis-Golgi network membrane directly contacts the Golgi lumen, including any protein embedded in, attached to, or peripherally associated with it. This is the site where glycosylation, cargo sorting, or interactions with resident Golgi proteins occur. GO:0140178 2025-06-05T08:47:14Z pg