part of lumenal side of membrane lumenal side of trans-Golgi cisternae membrane https://github.com/geneontology/go-ontology/issues/30510 https://github.com/geneontology/go-ontology/issues/31515 rynl GO:0160289 lumenal side of Golgi trans cisternae membrane The leaflet of the trans-Golgi cisternae membrane that faces the Golgi lumen, including any protein embedded in, attached to, or peripherally associated with it. This is the site where the final steps of glycan processing, proteolytic modification, and cargo maturation prior to sorting at the trans-Golgi network occur. lumenal face of trans-Golgi cisternae membrane lumenal leaflet of trans-Golgi cisternae membrane cellular_component 2025-06-27T06:11:48Z Golgi trans cisterna membrane