Western blot analysis of extracts from 293 cells, mock transfected (-) or transfected with a construct expressing either HA-tagged full-length human ATP6V1B1 protein (hATP6V1B1-HA; +) or Myc/DDK-tagged full-length human ATP6V1B2 protein (hATP6V1B2-Myc/DDK; +), using ATP6V1B1/2 Antibody (upper), HA-Tag (C29F4) Rabbit mAb #3724 (upper middle), Myc-Tag (71D10) Rabbit mAb #2278 (lower middle), and GAPDH (D16H11) XP® Rabbit mAb #5174 (lower).