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  • Banana Stem Cross Section
  • Stem cell transfer of mitochondria
  • Human embryonic stem cell (gold) growing on a layer of supporting cells (fibroblasts). Stem cells are derived from very early embryos and can either be grown to stay in their original state or triggered to form almost any type of human cell. The fibroblasts provide special factors that maintain the stem cells in their original state. The stem cell appears to be grasped by the underlying fibroblast. Stem cell research could lead to cures for many diseases such as Parkinson's disease, Alzheimer's and diabetes, where a patient's cells are damaged or absent.
  • Human embryonic stem cells
  • Human embryonic stem cells
  • Human embryonic stem cells
  • Brain cancer stem cells
  • Mouse embryonic stem cells
  • Mouse embryonic stem cells
  • Mouse embryonic stem cells
  • Human embryonic stem cells
  • Human embryonic stem cells
  • Human embryonic stem cells
  • Mouse embryonic stem cells
  • Mouse embryonic stem cells
  • Differentiated neural stem cells
  • Mouse embryonic stem cells
  • Mouse embryonic stem cells
  • Intra-uterine stem pessaries.
  • Pine stem under the microscope
  • Neural stem cells in culture
  • Derivation of embryonic stem cells
  • Derivation of embryonic stem cells
  • Queens flower: flowering stem. Watercolour.
  • A flowering plant stem. Watercolour.
  • A leafy plant stem. Watercolour.
  • A flowering plant stem. Watercolour.
  • A flowering plant stem. Watercolour.
  • Triumfetta semitrilobata Jacq.: flowering and fruiting stem with separate fruiting stem. Coloured engraving after F. von Scheidl, 1776.
  • Hellebore (Helleborus atrorubens): fruiting stem with roots and separate flowering stem. Coloured etching after J. Schütz, c.1802.