. "Any process in which a protein is maintained in the nucleus and prevented from moving elsewhere. These include sequestration within the nucleus, protein stabilization to prevent transport elsewhere and the active retrieval of proteins that escape the nucleus." . . . "maintenance of protein location in nucleus" . "maintenance of nuclear protein localization" . "maintenance of protein localization in nucleus" . "maintenance of protein location in cell nucleus" . "nuclear protein retention" . "nuclear protein sequestering" . "nuclear protein sequestration" . "protein retention in nucleus" . "protein sequestration in nucleus" . "protein storage in nucleus" . "protein-nuclear retention" . "sequestration of protein in nucleus" . "storage of protein in nucleus" . . . .