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Embryonic stem cell

Pluripotent stem-cell lines derived from the inner cell mass of early embryos no later than 14 days after fertilisation, before formation of the tissue germ layers.  Embryonic stem cells are both pluripotent – so have the potential to become different cell types in the body - and have an ability to replicate indefinitely.


When the nucleus is expelled from the cell in the final stages of red blood cell (erythrocyte) maturation.


Red blood cells.