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Preimplantation embryo
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Preimplantation embryo The very early, free-floating embryo, from the time the egg is fertilized (zygote) until the beginning of implantation (in humans, a period of about 6 days). Also includes embryos resulting from nuclear transfer, in all the developmental stages through the blastocyst stage.
RELATED TERMS--------------------------------------
Embryo
The early stages of development before an organism becomes self supporting.
Implantation
The process by which an embryo becomes attached to the inside of the uterus (7-14 days in humans).
Blastocyst
The developmental stage of the fertilized ovum by the time it is ready to implant; formed from the morula and consists of an inner cell mass, an internal cavity, and an outer layer of cells (the trophoblast).
SIMILAR TERMS--------------------------------------
Preimplantation genetic diagnosis (PGD)
Or preimplantation screening. Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Preimplantation screening
Or preimplantation genetic diagnosis (PGD) - Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Preiser's disease
Spontaneous osteonecrosis of the scaphoid bone in the wrist.
PREVIOUS AND NEXT TERMS--------------------------------------
Pollen
Pollen is the male fertilising agent of flowering plants, grasses, trees and weeds.
Provocation test
Also called a challenge test. A test performed on eyes, nose or lungs and used to diagnose an allergy or monitor the effect of e.g. specific allergy vaccination. The allergen is introduced in increasing doses to the organ to see if the person reacts and, if so, at what level of exposure.
Pluripotent stem cells (PSCs)
Stem cells that include in their progeny all cell types that can be found in a postimplantation embryo, fetus, or developed organism.
Precursor cells
Or progenitor cells - In fetal or adult tissues, these are partially differentiated cells that divide and give rise to differentiated cells.
Progenitor cells
Or precursor cells. In fetal or adult tissues, these are partially differentiated cells that divide and give rise to differentiated cells.
Preimplantation embryo
Preimplantation screening
Or preimplantation genetic diagnosis (PGD) - Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Preimplantation genetic diagnosis (PGD)
Or preimplantation screening. Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Prenatal diagnosis
Detection of abnormalities and disease conditions while a fetus is developing in the uterus. Many techniques for prenatal diagnosis, such as chorionic villus sampling and amniocentesis, require sampling placental tissue or fetal cells found in the amniotic fluid or fetomaternal circulation. Others, such as ultrasonography, can be performed without cell or tissue samples.
Pronuclei
See Pronucleus.
Pronucleus
Plural: pronuclei. Refers to the haploid nucleus of egg or sperm prior to fertilization, and immediately after fertilization, before the sperm and egg nuclei have fused into a single diploid nucleus.
RELATED TERMS--------------------------------------
Embryo
The early stages of development before an organism becomes self supporting.
Implantation
The process by which an embryo becomes attached to the inside of the uterus (7-14 days in humans).
Blastocyst
The developmental stage of the fertilized ovum by the time it is ready to implant; formed from the morula and consists of an inner cell mass, an internal cavity, and an outer layer of cells (the trophoblast).
SIMILAR TERMS--------------------------------------
Preimplantation genetic diagnosis (PGD)
Or preimplantation screening. Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Preimplantation screening
Or preimplantation genetic diagnosis (PGD) - Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Preiser's disease
Spontaneous osteonecrosis of the scaphoid bone in the wrist.
PREVIOUS AND NEXT TERMS--------------------------------------
Pollen
Pollen is the male fertilising agent of flowering plants, grasses, trees and weeds.
Provocation test
Also called a challenge test. A test performed on eyes, nose or lungs and used to diagnose an allergy or monitor the effect of e.g. specific allergy vaccination. The allergen is introduced in increasing doses to the organ to see if the person reacts and, if so, at what level of exposure.
Pluripotent stem cells (PSCs)
Stem cells that include in their progeny all cell types that can be found in a postimplantation embryo, fetus, or developed organism.
Precursor cells
Or progenitor cells - In fetal or adult tissues, these are partially differentiated cells that divide and give rise to differentiated cells.
Progenitor cells
Or precursor cells. In fetal or adult tissues, these are partially differentiated cells that divide and give rise to differentiated cells.
Preimplantation embryo
Preimplantation screening
Or preimplantation genetic diagnosis (PGD) - Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Preimplantation genetic diagnosis (PGD)
Or preimplantation screening. Before an in vitro-fertilized embryo is implanted in a woman's uterus, it can be screened for specific genetic mutations that are known to cause particular genetic diseases or for chromosomal abnormalities. One or more cells are removed from the preimplantation embryo for testing.
Prenatal diagnosis
Detection of abnormalities and disease conditions while a fetus is developing in the uterus. Many techniques for prenatal diagnosis, such as chorionic villus sampling and amniocentesis, require sampling placental tissue or fetal cells found in the amniotic fluid or fetomaternal circulation. Others, such as ultrasonography, can be performed without cell or tissue samples.
Pronuclei
See Pronucleus.
Pronucleus
Plural: pronuclei. Refers to the haploid nucleus of egg or sperm prior to fertilization, and immediately after fertilization, before the sperm and egg nuclei have fused into a single diploid nucleus.
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This dictionary contains 19186 terms.
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