Delacourt M C, Sobis H, Vandeputte M
J Natl Cancer Inst. 1976 Dec;57(6):1375-7. doi: 10.1093/jnci/57.6.1375.
alpha-Fetoprotein (AFP) was demonstrated by the immunofluorescent antibody staining technique in 1 primary and 3 transplantable yolk sac carcinomas of rats. AFP was observed only in structures with a characteristic endodermal appearance. This protein was not detected in embryonal carcinoma cells.20