[3H]estrone-3-sulfate
(57.3 Ci/mmol) and [3H]estradiol-17β-glucuronide
(46.9 Ci/mmol) were purchased from Perkin-Elmer (Boston, MA). Unlabeled
estrone-3-sulfate and estradiol-17β-glucuronide were purchased
from Sigma Aldrich (St. Louis, MO). Unlabeled valsartan, MTSES, and
[2-(trimethylammonium)ethyl]methanethiosulfonate bromide
(MTSET) were purchased from Toronto Research Chemicals, Inc. (North
York, Ontario, Canada). Sulfo-NHS-SS-biotin and maleimide-PEG2-biotin were purchased from Pierce Biotechnology (Rockford,
IL). The polyclonal anti-His antibody was purchased from Covance (Princeton,
IL), whereas the monoclonal antibody to detect Na+/K+ ATPase α subunit was purchased from Abcam (Boston,
MA).