Background and Objectives: Assisted reproductive techniques today have helped many infertile couples achieve their desired pregnancy.However, unsuccessful implantation is usually the key failure in in vitro fertilization cycles.
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"Human development begins after the union of male and female gametes or germ cells during a process known as fertilization (conception). Decker Inc, 1988, p.2] "Embryo: the developing organism from the time of fertilization until significant differentiation has occurred, when the organism becomes known as a fetus." [Cloning Human Beings. 146] "Embryo: The early developing fertilized egg that is growing into another individual of the species. 160] "The development of a human being begins with fertilization, a process by which two highly specialized cells, the spermatozoon from the male and the oocyte from the female, unite to give rise to a new organism, the zygote." [Langman, Jan. The term embryo covers the several stages of early development from conception to the ninth or tenth week of life." [Considine, Douglas (ed.). 31] "The development of a human begins with fertilization, a process by which the spermatozoon from the male and the oocyte from the female unite to give rise to a new organism, the zygote." [Sadler, T. zyg tos, yoked together), represents the beginning of a human being. 'Don't worry,' a doctor might say, 'it's only pre-embryos that we're manipulating or freezing.
"Fertilization is a sequence of events that begins with the contact of a sperm (spermatozoon) with a secondary oocyte (ovum) and ends with the fusion of their pronuclei (the haploid nuclei of the sperm and ovum) and the mingling of their chromosomes to form a new cell. Report and Recommendations of the National Bioethics Advisory Commission. In man the term 'embryo' is usually restricted to the period of development from fertilization until the end of the eighth week of pregnancy." [Walters, William and Singer, Peter (eds.). The common expression 'fertilized ovum' refers to the zygote." [Moore, Keith L. They won't turn into real human embryos until after we've put them back into your body.'" [Silver, Lee M.
Many factors are now being studied to improve the implantation rate, one being [...] Read more.
Many factors are now being studied to improve the implantation rate, one being endometrial artificial injury (endometrial scratching).
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3] "Embryo: The developing individual between the union of the germ cells and the completion of the organs which characterize its body when it becomes a separate organism.... 943] "I would say that among most scientists, the word 'embryo' includes the time from after fertilization..." [Dr. I think, as you know, that in development, life is a continuum.... This moment of zygote formation may be taken as the beginning or zero time point of embryonic development." [Larsen, William J. Thus the diploid number is restored and the embryonic genome is formed. The time of fertilization represents the starting point in the life history, or ontogeny, of the individual." [Carlson, Bruce M. In its place, they proposed the term pre-embryo.... The term pre-embryo has been embraced wholeheartedly by IVF practitioners for reasons that are political, not scientific.
3] "The question came up of what is an embryo, when does an embryo exist, when does it occur. These pronuclei fuse with each other to produce the single, diploid, 2N nucleus of the fertilized zygote. The combination of 23 chromosomes present in each pronucleus results in 46 chromosomes in the zygote. 12}] "Almost all higher animals start their lives from a single cell, the fertilized ovum (zygote)... "[A] number of specialists working in the field of human reproduction have suggested that we stop using the word embryo to describe the developing entity that exists for the first two weeks after fertilization.