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

[EX Q]: Carried through body happens if cancer cells enter the blood stream.
[EX A]: What happens if cancer cells enter the blood stream?

[EX Q]: Insulin is made up of two polypeptide chains.
[EX A]: Insulin is made up of how many polypeptide chains?

[EX Q]: The white of an egg becomes opaque denatured proteins cooked because what are insoluble and solidify.
[EX A]:
The white of an egg becomes opaque when cooked because what are insoluble and solidify?