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.
Below are the 33 Senate seats up for reelection in 2018 in alphabetical order by political party and state. Democrats up for reelection in 2018: California: Dianne Feinstein (Won by 63% in 2012) (Intent for 2018 unknown) Current age: 83