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Pluripotent stem cells (PSCs)
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.
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Progeny
Children.
Cell
Fundamental structural unit of all life. The cell consists primarily of an outer plasma membrane, which separates it from the environment; the genetic material (DNA), which encodes heritable information for the maintainance of life; and the cytoplasm, a heterogeneous assemblage of ions, molecules, and fluid.
Embryo
The early stages of development before an organism becomes self supporting.
Fetus
The stage of human development from 10 weeks' gestation until birth.
Organism
A living thing, such as an animal, a plant, a bacterium, or a fungus.
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A tremor of a limb that increases when the limb is stretched.
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A measurement of lung function, established by the patient's blowing into a special device. The higher the number recorded, the better the lung function. PEF is dependent on the severity of the disease, gender, age and height. A lower reading than expected may be caused by an allergy.
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)
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
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.
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.
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