Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
A desmosome is a cell structure that anchors the ends of cardiac muscle fibers together.

Ex Output:
A desmosome is a cell structure that anchors the ends of what fibers together?


Ex Input:
The action of flushing the toilet, performed multiple times daily, is the single biggest use of water in the home.

Ex Output:
What action, performed multiple times daily, is the single biggest use of water in the home?


Ex Input:
The orbital is the area where an electron is most likely to be found.

Ex Output:
What is the area where an electron is most likely to be found called?