Where do new cells come from?

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Across
  1. 4. Stem cells found in bone marrow that give rise to all types of blood cells.
  2. 5. Ability of a stem cell to differentiate into only one specific cell type.
  3. 6. Developing human from fertilisation until approximately eight weeks of development.
  4. 8. The process during early embryonic development in which the ectoderm, mesoderm and endoderm form.
  5. 9. An undifferentiated cell capable of both self‑renewal and differentiation.
  6. 11. Single cell formed by the fusion of a sperm and an egg.
  7. 12. Muscular organ where embryo implantation and foetal development occur.
  8. 16. Ability of a stem cell to differentiate into multiple but limited cell types.
  9. 17. Group of cells inside the blastocyst that develops into the embryo.
  10. 18. Middle embryonic layer that develops into muscles, bones, blood and connective tissues.
  11. 21. Ability of stem cells to divide and produce more stem cells.
Down
  1. 1. Adult cells that have been genetically reprogrammed to behave like embryonic stem cells.
  2. 2. The outer embryonic layer that develops into structures such as the nervous system and skin.
  3. 3. Pluripotent cells derived from the inner cell mass that can differentiate into almost any cell type.
  4. 7. Solid ball of cells formed after several divisions of the zygote and before the blastocyst stage.
  5. 10. Ability of a cell to form all cell types, including extra‑embryonic tissues.
  6. 13. Stage of embryonic development where three distinct germ layers are visible.
  7. 14. The innermost embryonic layer that forms organs such as the lungs and digestive tract.
  8. 15. Undifferentiated cells found in mature tissues that can divide and replace damaged cells.
  9. 19. Ability of a stem cell to differentiate into almost all cell types of the body.
  10. 20. Early stage human embryo consisting of a hollow ball of cells, formed about five days after fertilisation.