Support stem cell research and give at least three reasons to justify. (prompt: embryonic stem cell research is front page news these days. what is it? it is a proposal to use human embryos to grow stem cells or master cells that form immediately after a human egg is fertilized. the cells are called master or stem, because they can develop into all parts of the body, brain, blood, skin and muscle. the topic is controversial worldwide, with both advocates and opponents ready to expose the benefits and the drawbacks to such research)

(connections academy, ap lang, grade 11, "editorial: puritan preacher provokes", part b)

Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In addition, in many tissues they serve as a sort of internal repair system, dividing essentially without limit to replenish other cells as long as the person or animal is still alive. When a stem cell divides, each new cell has the potential either to remain a stem cell or become another type of cell with a more specialized function, such as a muscle cell, a red blood cell, or a brain cell.

Stem cells are distinguished from other cell types by two important characteristics. First, they are unspecialized cells capable of renewing themselves through cell division, sometimes after long periods of inactivity. Second, under certain physiologic or experimental conditions, they can be induced to become tissue- or organ-specific cells with special functions. In some organs, such as the gut and bone marrow, stem cells regularly divide to repair and replace worn out or damaged tissues. In other organs, however, such as the pancreas and the heart, stem cells only divide under special conditions.

Until recently, scientists primarily worked with two kinds of stem cells from animals and humans: embryonic stem cells and non-embryonic "somatic" or "adult" stem cells. The functions and characteristics of these cells will be explained in this document. Scientists discovered ways to derive embryonic stem cells from early mouse embryos more than 30 years ago, in 1981. The detailed study of the biology of mouse stem cells led to the discovery, in 1998, of a method to derive stem cells from human embryos and grow the cells in the laboratory. These cells are called human embryonic stem cells. The embryos used in these studies were created for reproductive purposes through in vitro fertilization procedures. When they were no longer needed for that purpose, they were donated for research with the informed consent of the donor. In 2006, researchers made another breakthrough by identifying conditions that would allow some specialized adult cells to be "reprogrammed" genetically to assume a stem cell-like state. This new type of stem cell, called induced pluripotent stem cells (iPSCs), will be discussed in a later section of this document.

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english novelist and poet, the eldest of the three brontë sisters who survived into adulthood and whose novels became classics of english literature.

she enlisted in school at roe head in january 1831, aged 14 years. she left the year after to teach her sisters, emily and anne, at home, returning in 1835 as a governess. in 1839 she undertook the role as governess for the sidgwick family, but left after a few months to return to haworth where the sisters opened a school, but failed to attract pupils. instead they turned to writing and they each first published in 1846 under the pseudonyms of currer, ellis and acton bell. her first novel the professor was rejected by publishers, her second novel jane eyre was published in 1847. the sisters admitted to their bell pseudonyms in 1848, and by the following year were celebrated in london literary circles.

brontë experienced the early deaths of all her siblings. she became pregnant shortly after her marriage in june 1854 but died on 31 march 1855, almost certainly from hyperemesis gravidarum, a complication of pregnancy which causes excessive nausea and vomiting.

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