host cell endoplasmic reticulum membrane obsolete integral to host endoplasmic reticulum membrane https://github.com/geneontology/go-ontology/issues/23424 true 2011-12-13T04:11:30Z This term was obsoleted because it represents protein topology, not a cellular component. GO:0044386 OBSOLETE. Penetrating at least one phospholipid bilayer of an endoplasmic reticulum membrane. May also refer to the state of being buried in the bilayer with no exposure outside the bilayer. Occurring in a host cell. jl cellular_component