for 1 h at RT
followed by an incubation with anti-NKA (α5, 1/100) or anti-NKCC (T4,
1/4000) overnight at RT. Membranes were then washed three times
(15 min each) with TTBS (0.1% Tween-20 in TBS; pH 7.4) and incubated
in alkaline-phosphatase-conjugated goat anti-mouse IgG (1/3000
diluted in Blotto) at RT for 1h and washed in TTBS. To visualize antibody
binding, membranes were incubated in a chemiluminescent signal
(Immun-star chemiluminescent kit, Bio-Rad) following the manufacturer's
protocol. Total protein present on the membranes was visualized
by incubating membranes in 0.02% Coomassie blue stain (diluted in 50%methanol, 10% acetic acid, and 40% water) for 1min. Exposed films and
Coomassie blue stained membranes were digitally imaged using a
flatbed scanner and brightened using Adobe Photoshop CS3 (San Jose,
CA USA).