TABLE 1.

Colony formation in Ras-transfected WRT cells^a

Transfected construct	No. of colonies formed
	With TSH	Without TSH
pDCR	405	290
RasG12	746	476
RasG37	760	671
RasS35	458	507

^aOnly colonies larger than 0.5 mm in diameter were scored. Results shown are from the experiment depicted in Fig. 1. Three independent experiments yielded similar results.