obsolete regulation of multivesicular body size involved in endosome transport https://github.com/geneontology/go-ontology/issues/21719 true The reason for obsoletion is that this term represents an assay and not a real GO process. OBSOLETE. Any process that modulates the volume of a multivesicular body as part of the directed movement of substances from endosomes to lysosomes or vacuoles. biological_process GO:0010797