What's the difference between endoderm and entoderm?
Endoderm
Definition:
(n.) The inner layer of the skin or integument of an animal.
(n.) The innermost layer of the blastoderm and the structures derived from it; the hypoblast; the entoblast. See Illust. of Ectoderm.
Example Sentences:
(1) In contrast, F9ACC19, an endodermal cell line derived from F9 cells, synthesizes only minor amounts of lactosaminoglycans and a high proportion of smaller glycopeptides.
(2) Both genes are expressed in the fetal liver, gut, and visceral endoderm of the yolk sac and are repressed shortly after birth in the liver and gut.
(3) Examination of the two types of tissue fragments revealed that IS-treated ICMs almost invariably retained viable endoderm cells whereas MS-isolated ectoderms did so only exceptionally.
(4) LIF inhibits differentiation under several conditions which lead to endodermal and mesodermal cell lineages including skeletal and cardiac muscle.
(5) This epithelial cell was tentatively identified as primitive extraembryonic endoderm by its ultrastructural appearance and its possession of cytokeratin intermediate filaments.
(6) The majority of testicular germ cell tumors in adults are accompanied by neoplastic intratubular germ cells; these cells were uniformly absent in ten pure yolk sac tumors (endodermal sinus tumors) of the testicle in children studied morphologically and immunohistochemically.
(7) After the treatment in toto of the embryos from various species of Anura by cAMP, the number of primordial germ cells (PGC) in genital ridges is strongly reduced; the most part of the PGC are found in the endoderm.
(8) Our experience suggests that the optimal management of patients with primary mediastinal endodermal sinus tumor requires an aggressive multidisciplinary approach guided by the extent of the tumor and the serum tumor marker levels.
(9) The tissues of the endodermal and mesodermal origin were also present in small quantities.
(10) Although the liver first forms as a discrete epithelial bud of endodermal tissue at stage 12-14 (45-53 h after laying), canaliculi were first detected by our antibodies at low levels in 4-day embryos and at high levels in stage 27 (5 days after laying) and later embryos.
(11) The cell cycle time of the gland cells appears to be longer than that of the epithelial cells of the endoderm throughout the animal.
(12) As development proceeded during primitive streak stages, the visceral and parietal endoderm became positively stained.
(13) The F9 cell is a mouse embryonal teratocarcinoma which can be induced to differentiate into visceral endoderm by treatment with retinoic acid (RA).
(14) Multiple hamartoma syndrome, also known as Cowden's disease, is a rare genodermatosis with multiple organ system involvement affecting tissues derived from ectodermal, endodermal, and mesodermal tissue layers.
(15) This finding suggests the identification of a cell population that is analogous to parietal endoderm in some eutherian animals.
(16) We recently showed that yolk sac is involved in the control of metabolism and action of vitamin D in the fetoplacental unit, since its endodermal cells contain a 24-hydroxylase for vitamin D metabolites and the 1,25-dihydroxyvitamin D receptor.
(17) These data thus demonstrate the production and presence of RBP mRNA and TTR mRNA, and the synthesis and secretion of RBP and TTR, by F9 cell embryoid bodies (specifically by visceral endoderm-like cells).
(18) We conclude that yolk-sac-derived teratomas are of endodermal origin because of the fact that the paternal X chromosome is inactivated in the yolk sac endoderm, whereas in the yolk sac mesoderm, as in the embryo, the inactivation is at random.
(19) A particularly interesting proteinase active at alkaline pH values is detected in the trophoblast-endoderm complex.
(20) It is therefore considered that, although there is good evidence that serum AAT is produced by endodermal sinus tumour elements, serum AAT is not a useful monitor of disease activity in these patients, especially when compared with serum AFP, the value of which is well recognized.
Entoderm
Definition:
(n.) See Endoderm, and Illust. of Blastoderm.
Example Sentences:
(1) This fact shows that the localization of the prechordal lamina coincides with the disposition of the Seessel's pouch lining, the histological nature of its material being identical to the entoderm.
(2) It therefore seems that the initially described high preponderance of CEA positivity of entodermal organs, previously observed for later stages of gestation, can be confirmed.
(3) There are no essential differences in time between cranial and caudal parts of the esophagus which proofs an entodermal genesis of the epithelium.
(4) Vasoactive intestinal peptide (VIP) receptors are widely distributed in different tissues or carcinoma cells originating from entoderm and have been shown to regulate the growth of colonic adenocarcinoma cells through the action of cyclic AMP (cAMP).
(5) It was found that CEA was expressed by derivates of all three germ layers, although the strongest reactions and the highest incidence of positivity was found in organs derived from the entoderm.
(6) Vaginal differentiation occurs only if müllerian ducts contact the urogenital sinus, inducing proliferation of the entodermal epithelium and if the caudal ends of the müllerian ducts do not regress.
(7) It is considered that the junction between these 2 epithelia corresponds to the former site of the junction of the entoderm and ectoderm.
(8) Pulmonary (peribronchial) lesions have also been described in the same animals and are considered to be of similar origin and to represent a cross reaction with tissue of similar embryological (entodermal) origin.
(9) In 9,5-day embryos the primary sex cells are localized in the mesenchyma of the allantois and in the intestinal entoderm.
(10) The development of liver parenchyma starts from entodermal cells which grow out from the gut into the mesenchyma of the septum transversum.
(11) The group of hamartomas, tumors of "erroneous mixture of tissue", included 20 cases which can be considered a malformation of the entodermal bronchial anlage, and 3 cases which can be regarded as a malformation of the mesenchymal anlage.
(12) Embryonic neural crest cells have been traced to the primitive entoderm where they differentiate into a family of hormone-producing cells, APUD cells.
(13) Our findings lead us to believe that (a) the cortical differentiation of the thymic component and the active thymocyte proliferation could represent a factor leading to myasthenia gravis; and (b) thymolipoma could be a peculiar form of thymoma rather than a mixed tumor of mesenchymal and entodermal origin, a lipoma, or a hamartoma of the thymic gland.
(14) CEA is a normal constituent of fetal cells, which can reappear in entodermally-derived neoplasms, following a de-repression process.
(15) The cells form from the entodermal part of the rudiment of the last pharyngeal cavity.
(16) These data indicate that the levels of precursor-like antigens in entodermal tumours and their possible diagnostic value warrant detailed investigation.
(17) The results indicate that cells of different developmental lineages (entodermal and mesodermal) can produce identical TM beta gene splice products while regulating expression of those transcripts in a lineage-specific way.
(18) "Fingerprints" of metastatic adenomas of entodermal origin showed quantitative and qualitative increases in molecules with CEA determinants unlike these latter categories.
(19) The embryonic node consisted of the primary ectodermal cell mass and the primary entodermal cells, surrounding the former.
(20) The development of the different cells may start from a pool of omnipotent cells (entodermal stem cells of the foregut) present in the walls of the ductules, or from undifferentiated cells, reflecting their embryonic potential as a result of proliferation of duct cells (i.e.