Western blot analysis of extracts from 293T cells, mock transfected (-) or transfected with constructs expressing Myc/DDK-tagged full-length human UBQLN1 protein (hUBQLN1-Myc/DDK; +), full-length human UBQLN2 protein (hUBQLN2-Myc/DDK; +), and full-length human UBQLN3 protein (hUBQLN3-Myc/DDK; +), using UBQLN2 Antibody (upper) and DYKDDDDK Tag Antibody #2368 (lower).