Vladimir Lenin led the Bolshevik Revolution, helped create the Soviet Union and launched the communist era in Russia. Learn more at Biography.com. Vladimir Lenin was founder of the Russian Communist Party, leader of the Bolshevik Revolution and architect and first head of the Soviet state.
The disadvantages come entirely from the source of stem cells. For embryonic stem cells, a human blastula (the collection of cells that will eventually become a fetus) must be sacrificed. This brings forth an image of sacrificing babies for science, and needless to say, many folks have a problem with that.
STEM CELL INTRO. Ordinary cells in your body replicate to make new cells of the same type - blood cells make more blood cells, skin cells make more skins cells and so on. However, there is another type of cell, called a stem cell. Stem cells are able to repair or replace damaged tissue. This is why scientists and doctors are so excited about the growing role of stem cells to treat disease, injury, and the deterioration of tissue due to aging.