GTP, or Guanosine Triphosphate, is a molecule similar to ATP that provides energy for protein synthesis and signal transduction in cells.
GDP (Guanosine Diphosphate): This is what remains after a phosphate group is removed from GTP during energy transfer.
Another high-energy molecule that cells use as their main source of energy.
The process by which a chemical or physical signal is transmitted through a cell via a series of molecular events.