stem cells

• cell differentiation:

  Transition of a cell from one type to another
• blastocyst:

  hollow ball of cells that develops at day 5

  The cells inside the blastocyst are pluripotent
• fertilised egg:

  Outer layer of cells forms the placenta

  Inner layer of cells form the tissues of the developing embryo
• Plant cells retain their unipotency despite differentiating.This means that a single plant cell can give rise to an entire new plant