The experiment was conducted in primiparous sows to determine whether progesterone supplementation during early pregnancy could improve embryonal survival and to confirm a functional relationship between progesterone concentrations in the postovulatory period and embryonal survival. Thirty-four primiparous sows were fed for ad libitum intake from farrowing to d 21 of lactation, restricted to 50...

muscle. Three major histologic types are described: pleomorphic, embryonal, and alveolar.' The pleomorphic type arises from myotome-derived skeletal muscle (adult variety), the embryonal type originates from undifferentiated mcsoderm (juvenile variety), and the alveolar type is related to the embryonal type. Alveolar rhabdomyosarcoma has been reported in dogs, either as locally infiltrating or ...

A series of human germ cell-derived tumors were examined for the presence of nucleoli which persist through mitosis. Embryonal carcinomas, seminomas, and the cytotrophoblasts of choriocarcinomas had persistent nucleoli in more than 70% of mitoses. The differentiated cells derived from embryonal carcinomas, endodermal sinus tumors, and the more differentiated elements of choriocarcinomas only ra...

Rhabdomyosarcoma is the malignant neoplasm of striated muscle and a relatively uncommon tumor of the oral cavity. Embryonal variety is the most common subtype, observed in children below 10 years of age but occasionally seen in adolescents and young adults. The present report describes a case of embryonal rhabdomyosarcoma in the left posterior buccal mucosa, with extension in the adjacent alveo...

Primary undifferentiated embryonal sarcoma of the liver is a rare tumor with a peak incidence between the ages of 6 and 10 years. We report a case of a primary hepatic undifferentiated embryonal sarcoma arising in a 21-year-old male mistaken for hydatid disease of the liver. The rapid recurrence of this tumor along the site of attempted percutaneous drainage illustrates some important managemen...

Primary undifferentiated embryonal sarcoma of liver is an extremely rare pathologic entity in the adult population. An unusual case is reported of a 44-year-old female who presented with multiple hepatic cysts and peripheral eosinophilia, initially thought to be hydatid disease of the liver. Angiogram revealed neovascularization. Surgical biopsy showed an anaplastic mesenchymal neoplasm. Pathol...

Neural stem cells, which differentiate into neurons and glia, are present in the ventricular zone of the embryonal brain. The precise mechanism by which neural stem cells are maintained during embryogenesis remains to be determined. Here, we found that transient misexpression of the basic helix-loop-helix genes Hes1 and Hes5 keeps embryonal telencephalic cells undifferentiated although they hav...