How To Use Germ cell In A Sentence
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The anthozoans are diploblastic animals developing from two epithelial germ cell layers: the ectoderm, facing the seawater, and the endoderm, facing the gastrovascular cavity or coelenteron.
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Objective: To investigate the development of xenografted primitive human germ cells by using fetal testicular tissues as donor tissues and an immunodeficient mouse as the recipient.
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In mammals, signals from the gonads determine whether the germ cells develop into oocytes or sperm.
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An emerging constant among vertebrates is the presence of a germinal epithelium composed of somatic and germ cells in both males and females.
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Instead, multiple undifferentiated germ cells appear in the severely truncated ovarioles.
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The most urgent diagnosis is retinoblastoma, a malignancy most likely arising from retinal germ cells.
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Firstly, risks to the descendants of trial participants because of the inadvertent modification of germ cells are not identical to those for chemical mutagens.
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_Every cell comes from a pre-existing cell_ by a process of division, and _every germ cell comes from a pre-existing germ cell_.
Manhood of Humanity.
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This suggests a mutagenic source different from germ cell replication.
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However, in cryptorchid testis, in which most germ cells undergo apoptosis, only a few of SRG4 is observed, suggesting that SRG4 may be as a specific marker to evaluate the process of spermatogenesis.
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Later, however, these germ cells undergo meiosis, to produce gametes.
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Instead, these germ cells appear to redivide to form clusters of abnormal germ cells that degenerate or occasionally produce tumorous cysts.
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The anthozoans are diploblastic animals developing from two epithelial germ cell layers: the ectoderm, facing the seawater, and the endoderm, facing the gastrovascular cavity or coelenteron.
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The scientists also produced a continuously growing line of cultured embryonic germ cells.
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The constant effect over time argues in favour of either paternal germ cell mutation or other damage to spermatogenic stem cells or the testicular cells necessary for supporting spermatogenesis.
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Conversion results in non-Mendelian segregation of alleles in the germ cell where it occurs.
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Surprisingly, most gld - 2; gld - 3 germ cells arrested in pachytene, a synthetic phenotype suggesting redundancy for progression into diplotene (data not shown).
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Development consisted of the orderly assembly and expression of the gemmules transmitted via the parental germ cells to the progeny.
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Dr Takeuchi and his colleagues took primordial germ cells from an embryonic North American rainbow trout and transplanted them into the embryos of the masu salmon, which is only found in east Asia.
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Homologous chromosomes are fully aligned at the pachytene stage, and germ cells survive to complete meiosis and gametogenesis with high efficiency.
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A further level of complexity is added in germ cells where homologous chromosomes pair and segregate in meiosis I and sister chromatids remain associated until meiosis II.
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Consistent with these findings, Sxl-Pe is not activated in germ cells of blastoderm embryos.
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Objective: To investigate the development of xenografted primitive human germ cells by using fetal testicular tissues as donor tissues and an immunodeficient mouse as the recipient.
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We show that two sex-determination signals, the X chromosome number within the germ cells and a female soma, differentially regulate ovo-B and ovo-A.
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These are identified by the alternation of the germinal epithelium between continuous and discontinuous types and the stages of germ cells present.
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The scientists also produced a continuously growing line of cultured embryonic germ cells.
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In the intact egg, the chalazae allow the germ cell to return to the top whenever the hen rearranges her eggs.
On Food and Cooking, The Science and Lore of the Kitchen
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depressors," "suppressors," and "determiners" which were present in the two microscopic and mosaic germ cells which united to start the embryo at the time of conception.
The Mother and Her Child
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Spermatogonia are the mitotic germ cells of the testis from which sperm arise by spermatogenesis.
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By developing suitable tests with embryonic stem cells as they differentiate to germ cells we can investigate the action of these chemicals in the laboratory.
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Teratomas are germ cell tumors composed of various tissue elements representing more than one embryonic layer (ectoderm, mesoderm, and endoderm).
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Normally, the adult proximal germline contains germ cells undergoing gametogenesis and proliferation is restricted to the distalmost part of the adult gonad.
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In some cases, germ cells appeared to be in various stages of disintegration.
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There was intratubular germ cell neoplasia, unclassified type, in the adjacent testicular parenchyma in both cases.
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Homologous chromosomes are fully aligned at the pachytene stage, and germ cells survive to complete meiosis and gametogenesis with high efficiency.
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Once hCG is initiated, it takes at least 70-80 days for germ cells to reach the spermatozoal stage.
MLB Rumors at MLBnewsonline.com
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We find that 2X germ cells express high levels of ovo-B regardless of the sexual identity of either the surrounding soma or the germ cells themselves.
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Specification of the primordial germ cells (PGCs) takes place via different strategies across animal phyla; either specified early in embryogenesis by the inheritance of maternal determinants in the cytoplasm of the oocyte ( 'preformation') or selected later in embryonic development from undifferentiated precursors by a localized inductive signal ( 'epigenesis').
BioMed Central - Latest articles
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Once within the gonads, the germ cells differentiate as either male or female gametes.
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The most urgent diagnosis is retinoblastoma, a malignancy most likely arising from retinal germ cells.
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Germination of wild-type spores is initiated by an isotropic growth phase generating spherical germ cells.
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During human fetal development, the primordial germ cells migrate to and are incorporated within the developing ovary and are termed oogonia.
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In wild-type hermaphrodites, germ cells at the dorsoventral flexure exit the pachytene stage of the first meiotic prophase and proceed to diakinesis.
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These primordial germ cells are diploid, meaning that they have all the normal chromosomes of the organism in pairs.
CreationWiki - Recent changes [en]
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It targets germ cell tumours which make up just three per cent of all childhood cancers but have doubled in 45 years.
The Sun
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This gene, when mutated, severely disrupts both germ cell migration and developmental cell death.
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The relationship between germ cell and sertoli cell is discussed.
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Target genes in this class may normally affect early germ cell proliferation or survival.
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Mutated DNA can only be passed to the next generation if it is present in a germ cell such as spermatozoa and ova, each of which contribute half of the DNA of the new organism.
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The anthozoans are diploblastic animals developing from two epithelial germ cell layers: the ectoderm, facing the seawater, and the endoderm, facing the gastrovascular cavity or coelenteron.
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In mammals, germ cells undergo a small number of proliferative mitotic cell divisions as they migrate to the gonad.
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Those who said they had used marijuana were twice as likely to have mixed germ cell tumours which are more often fatal, it was found.
Times, Sunday Times