Given a scientific question, generate a correct answer to it.

[EX Q]: Activated macrophages and neutrophils discharge what that signals molecules that enhance an immune response?
[EX A]: cytokines

[EX Q]: What is a hydrocarbon in which the carbon chain joins to itself in a ring?
[EX A]: cyclic hydrocarbon

[EX Q]: Higher pressures increase the solubility of what?
[EX A]:
gases