Table 1.

DNA synthesis response to serum or PDGF

	[3H]Thymidine/incorporation, CPM
Human serum 10%	39543  ±  3886
+Echistatin 10−8 M	38774  ±  4107
+Echistatin 10−7 M	38662  ±  3943
PDGF 30 ng/ml	28986  ±  3011
+Echistatin 10−8 M	24621  ±  2462
+Echistatin 10−7 M	22499  ±  2776
Platelet-poor plasma	4539  ±  492

The results are the mean ± SD of triplicate determinations in three separate experiments.