Animal Testing Perspective Animal testing & research dialogue

Stem cells are unspecialized “master” cells that differ from other kinds of cells in the human body in that they have a unique capacity to multiply and differentiate into many types of specialized cells and tissues. Stem cells exist at all stages of human development from early embryos to fetuses to adults. There are three types of stem cells: embryonic, fetal and adult. While the use of adult stem cells is well accepted and non-controversial, research into embryonic and fetal stem cells raises a number of ethical questions.