Which of the following was an invention (by Roger Tsien) that enabled the first precise spatial and temporal measurements of intracellular calcium dynamics?

Which of the following was an invention (by Roger Tsien) that enabled the first precise spatial and temporal measurements of intracellular calcium dynamics?





  1. Voltage clamp
  2. Fura-2
  3. Calcium green
  4. GFP
  5. Channelrhodopsin

Answer: 2