Research Article

Tumorigenic and Differentiation Potentials of Embryonic Stem Cells Depend on TGFβ Family Signaling: Lessons from Teratocarcinoma Cells Stimulated to Differentiate with Retinoic Acid

Table 1

Tumor development after transplantations of RA-stimulated ES R1 and EC F9 into immunodeficient nude mice.

Transplantation sitesES R1 + RA5ES R1 + RA10EC F9 + RA5EC F9 + RA10

SC3/3 (100%), 6 wk4/4 (100%), 6 wk3/3 (100%), 6 wk0/6 (0%), 30 wk
IP3/3 (100%), 6 wk4/4 (100%), 6 wk3/3 (100%), 6 wk0/8 (0%), 30 wk

The percentage and number of animals are indicated in which tumors were found in the transplantation sites during autopsy. SC: subcutaneous transplantation; IP: intraperitoneal transplantation (the cells grown on acetate cellulose membranes).