ere are many confusing terms that are used in stem cell research. A stem cell is when a single cell divides again and again to form an embryo. Several days after that the embryo contains a cluster of cells that scientists call embryonic stem cells. These types of cells can give rise to all the specialized cells in the body. A human embryonic stem cell is from an unborn baby's umbilical cord. A human embryonic stem cell is an unspecialized cell found I an embryo from which all the specialized cells in the body develop. An adult stem cell is a stem cell from a born child or an adult. A hematopoietic stem cell is blood producing and comes from bone marrow. Differentiation is the process of developing from unspecialized cells to specialized cells. Gene is a unit of heredity, found in the nucleus of a cell. It directs the production of an enzyme or other protein. Nucleus is the structure in a cell that contains the genes. Placenta is a structure in a pregnant woman's uterus that nourishes the developing embryo. Tissue is a group of cells of one or more types that work together to carry out a specific function. Uterus is the organ in a woman's body in which an embryo grows until the time of birth, it is also called a womb. Cell culture is growing cells in a laboratory. A clone is an exact copy of a parent cell or organism. These are all the terms used in stem cell research.
             Human embryonic stem cells are the biggest controversial issue in stem cell research. This is because people believe that in using human embryonic stem cells scientists are causing abortion. Scientists argue this because the human embryonic stem cells that they use are left over from in vitro fertilization. Couples who cannot have babies come in and get 20 eggs or possible babies. A majority of couples take two of the eggs and have the choice to either throw them away or to donate them for stem cell research. So scientists argue that either way the eggs will not live, b...