suppressive effect on pituitary TSH secretion (9). They also found that it was much more potent than T4 (10), although it was less abundant than T4 in the thyroid gland (11). Based on these findings Gross and Pitt-Rivers hypothesized that T3 was the active peripheral thyroid hormone and T4 was its precursor.
(Photo: Tom Tingle/The Republic) U.S. Sen. Jeff Flake may have a long two years ahead of him. Up for re-election in 2018, the first-term Arizona Republican is already under attack from the right and the left.
Sen. Joe Manchin (D-WV) (C) talks with reporters after he voted for Sen. Jeff Sessions (R-AL) to become the next U.S. Attorney General at the U.S. Capitol February 8, 2017 in Washington, DC. (Getty) Only one Democrat voted to approve Donald Trumpâs nominee Jeff Sessions as Attorney General: Joe Manchin. Manchin, 69, is a U.S. Senator from West Virginia, who is a former governor.