Proembryo

Proembryo

Proembryo, or preembryo, is a term created with the development of in vitro fertilization (IVF) to describe egg cells (ova) that have been fertilized but not yet implanted into a uterus. Dr. Ford (1988) suggested the term proembryo for this stage of development.Fact|date=March 2007

A proembryo is the preimplantation, post fertilization stage in the "human life cycle", where we have at least one new "human being", but not yet an "individual human being" and thus not yet a "person".Verify source|date=April 2007 From the formation of the primitive streak (shortly following the completion of implantation), individuality has been determined, however there is debate as to whether this "individual human being" is, or should be considered, a "person".----The illustration shows the ontological status of the preembryo, embryo, and fetus:


*(o) indicates the (natural &) standard reproductive and embryogenic pathway
*(mz) indicates all the possible pathways for a monozygotic twin (see Scott, 2002, Hall, 2003, for a review on monozygotic twinning)
*(/c) indicates a clone created by either SCNT or ANT (See Hurlbut, 2005, and section III. Pluripotent Stem Cells Derived from Biological Artifacts in the PCBE's [http://www.bioethics.gov/reports/white_paper/text.html#_ftn24 Report on alternative sources of stem cells] for a review of ANT))
*(ch) indicates all the possible pathways for a chimeric individual (see Charles E. Boklage, 2006, for a review on chimerism and twinning)
*(dz) indicates the pathway of a dizygotic twin
*(en) indicates an enucleated oocyte
*(m) indicates a hydatidiform mole
*(cm) indicates a complete hydatidiform mole
*(pm) indicates a partial hydatidiform mole, and
*(p) indicates parthenogenesis.
*(O) indicates an oocyte,
*(Z) indicates a zygote,
*(M) indicates a morula,
*(B) indicates a blastocyst,
*(E) indicates an embryo,
*(F) indicates a fetus,
*(I) indicates a live born individual person.
*(PM) indicates a partial hydatidiform mole,
*(CM) indicates a complete hydatidiform mole,
*(T) indicates a teratoma.
The colors represent the maternal and paternal genetic contributions.

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Look at other dictionaries:

  • Proembryo — Pro*em bry*o, n. [Pref. pro + embryo. ] (Bot.) (a) The series of cells formed in the ovule of a flowering plant after fertilization, but before the formation of the embryo. (b) The primary growth from the spore in certain cryptogamous plants; as …   The Collaborative International Dictionary of English

  • Proembryo — Proembryo, aus der Zygote hervorgehendes Stadium der Embryonalentwicklung bei Samenpflanzen, aus dem sich Embryo und Suspensor entwickeln …   Deutsch wörterbuch der biologie

  • proembryo — proembrionas statusas T sritis augalininkystė apibrėžtis Jaunas gemalas ankstyvose rutuliojimosi stadijose, t. y. po zigotos susiformavimo iki embriono dengiamųjų audinių susidarymo. atitikmenys: angl. proembryo rus. проэмбрион …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • proembryo — noun a) A cluster of cells in the ovule of a fertilized flowering plant that has not yet formed into an embryo b) The protonema of mosses …   Wiktionary

  • Proembryo — Pro|ẹmbryo,   Vorkeim der Samenpflanzen (Samenentwicklung) …   Universal-Lexikon

  • Proembryo — Pro|em|bryo* der; s, Plur. onen u. s <zu ↑pro... u. ↑Embryo> Vorembryo, Zellreihe aus der ↑Zygote einer Samenanlage, aus deren vorderen Zellen der Embryo entsteht (Bot.) …   Das große Fremdwörterbuch

  • proembryo — pro·embryo …   English syllables

  • proembryo — /proʊˈɛmbrioʊ/ (say proh embreeoh) noun the group of cells produced by division of a zygote before differentiation of the embryo proper …  

  • proembryo — …   Useful english dictionary

  • Заросток — (proembryo, prothallium). Под этим именем подразумевают первый и притом половой побег высших споровых растений: плаунов, папоротников, хвощей и пр. Самый термин, предложенный автором этой статьи еще в 1860 г. и вошедший во всеобщее употребление,… …   Энциклопедический словарь Ф.А. Брокгауза и И.А. Ефрона

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