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.
Hypothesis #1: Cancer Cells Arise from Stem Cells. Stem cells are distinguished from other cells by two characteristics: (1) they can divide to produce copies of themselves, or self-renew, under appropriate conditions and (2) they are pluripotent, or able to differentiate into most, if not all, mature cell types.