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Allie 12-Trees is on her way to the physics department, carrying an icebox full of proteins.

So is this a journey you have to do multiple times a day then?

It can be, yeah.

No more than twice.

I try to make it no more or twice.

The proteins in the cooler are motor proteins taken from neurons,

where they shuttle cargo up and down to keep the cells healthy.

They've already taken Ali's several days to prepare. Now it's the fun bit. She's going to see

if she can make out their shapes under a special microscope. So we're just walking up past

the students' union and the physics building is behind the student's union and that's where

the microscope is.

...