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Across: 1. The process by which unspecialised cells become specialised. (15) 3. Term used to describe stem cells which can only give rise to a limited range of cells. (11) 4. Term used to describe stem cells which can give rise to a complete range of cells. (11) 5. An early embryo consisting of a ball of embryonic cells. (10) 6. Cancer of the blood which can be treated with a bone marrow transplant. (9) 8. Type of stem cells able to differentiate into a complete organism. (10) 10. Area of a plant where cells divide. (8) 11. Blood sugar disorder which may be treated by stem cell technology in the future. (8) 12. Front cover of the eye which can now be treated with stem cells. (6) 13. Mass of undifferentiated cells in a plant. (6)

Down: 2. A source of human stem cells. (8,5) 7. Questions raised about the morals of stem cells. (6) 9. Type of stem cell capable of unlimited differentiation. (9)