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Non-neoplastic globe pathology non-neoplastic globe
Non-neoplastic globe pathology non-neoplastic globe

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characterization of adult and embryonic stem cell proliferation
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... stem cell is. A variety of definitions have been proposed, but a common set of terms and properties emerged that serves as a starting point. By focusing on embryonic stem cells and neural stem cells we compared and contrast the two most common “types” of stem cells: embryonic and adult stem cells. T ...
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... and S/M. The Chlamydomonas cell cycle is synchronized by light-dark cycles, so in principle, these transcriptional changes could be directly responsive to light or to metabolic cues. Alternatively, cell-cycle-periodic transcription may be directly regulated by cyclin-dependent kinases. To distinguis ...
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(Momordica charantia) and Bitter (Andrographis
(Momordica charantia) and Bitter (Andrographis

... development of cells in bone marrow. B cells in the immune system will produce B220 (surface marker) during the formation of plasma cells [11]. In addition, the increase in the relative amount of B220 cells caused by STZ mice injected into the body will cause free radical formation in the body prefo ...
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Cellular differentiation



In developmental biology, cellular differentiation isa cell changes from one cell type to another. Most commonly this is a less specialized type becoming a more specialized type, such as during cell growth. Differentiation occurs numerous times during the development of a multicellular organism as it changes from a simple zygote to a complex system of tissues and cell types. Differentiation continues in adulthood as adult stem cells divide and create fully differentiated daughter cells during tissue repair and during normal cell turnover. Some differentiation occurs in response to antigen exposure. Differentiation dramatically changes a cell's size, shape, membrane potential, metabolic activity, and responsiveness to signals. These changes are largely due to highly controlled modifications in gene expression and are the study of epigenetics. With a few exceptions, cellular differentiation almost never involves a change in the DNA sequence itself. Thus, different cells can have very different physical characteristics despite having the same genome.A cell that can differentiate into all cell types of the adult organism is known as pluripotent. Such cells are called embryonic stem cells in animals and meristematic cells in higher plants. A cell that can differentiate into all cell types, including the placental tissue, is known as totipotent. In mammals, only the zygote and subsequent blastomeres are totipotent, while in plants many differentiated cells can become totipotent with simple laboratory techniques. In cytopathology, the level of cellular differentiation is used as a measure of cancer progression. ""Grade"" is a marker of how differentiated a cell in a tumor is.
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