FIG. 7.

Ras^S35, but not Ras^G37, inhibits Tg expression. WRT cells (A), pDCR-transfected controls (B), and Ras^G37 (pool 1) (C) and Ras^S35 (pool 10b) (D) cells were stimulated with TSH (1 mU/ml) and stained for Tg expression 48 h later. Photomicrographs were taken at identical exposure times. Three independent experiments with these isolates yielded similar results. Three independent isolates of Ras^S35-expressing cells and two independent isolates of Ras^G37-expressing cells were analyzed.