All complex organisms are made up of a variety of different types of cells, eg nerve cells, muscle cells, blood cells., These specialised cells all differentiate from one type of cell called a stem cell., Stem cells are undifferentiated cells that can give rise to many more cells of the same type., There are two main types of stem cell, embryonic and adult., Embryonic stem cells can differentiate into any type of cell. Adult stem cells can only differentiate into certain cells, eg bone marrow stem cells can only give rise to blood cells., Stem cells can be cloned to produce millions of the same type of cell. These can be used to replace damaged cells and treat conditions like Alzheimer's and paralysis,

Stem cells

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