What are Stem Cells

To understand 1 hour e loans stem cells, it’s necessary to summarize briefly the development of an individual. Each individual begins as a single cell—a zygote or an ovum fertilized by a spermatozoon. This fertilized ovum has all the instructions coded in the DNA to make us what we are physically (given the right environmental conditions). But as the embryo grows, different cells in different places have to specialize, so that only certain instructions are executed—the cells become differentiated. The instructions are there, but turned off somehow. There are complicated genetic switches involved, and also a process called methylation— 100 approval loans attaching methyl groups to the chemical ‘letters’ of DNA which code for instructions that need to be ‘turned off’.

All the on/off switching must occur in the right sequence; the information of this sequence is partly encoded in the DNA, but there are also controls outside the genes, hence the term epigenetic. This is why it would be impossible to clone dinosaurs and mammoths even if we found intact DNA—-we would need the ovum (mother’s egg) too.

The result of these elaborately designed switching sequences is that bone cells execute only instructions pertaining to montel williams cash bone—the instructions for blood, nerves, skin, etc. are still in the cells’ DNA, but turned off. Similarly for blood, skin and other types of cells.

However, stem cells are undifferentiated, because they are like embryonic cells in that their instructions haven’t been turned off, so they have the potential to grow into any type of tissue. Therefore many researchers have high hopes that they could be used to regrow damaged tissue. They hope that it could help Parkinson’s disease, insulin- dependent (Type 1) diabetes (IDD), heart disease, Alzheimer’s disease and repair nerves damaged by spinal injuries.

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