The proteins act as molecular spies that tell us what is happening within cells in the living mouse. |
There's so much background light and reflection and motion that you need something very bright to be able to detect these cellular signals. |
These cells have to die, because if they didn't the heart would not function properly. |
We knew that the heart starts to pump at around 9.5 days. |
We knew there had to be a delay in this, but we had no idea how it occurred. |
We learn a lot by taking cells out, chopping them up, and looking at individual molecules. But it doesn't tell us what we need to know about the complex interactions between cells. |