Modern vaccine component

RNA

Think of the genetic material that helps your body build proteins to fight viruses.

This clue points to "RNA" because it’s a key ingredient in some of the newest vaccines, like the mRNA shots for COVID-19. The term "modern" hints at recent scientific advances, while "vaccine component" directly refers to the genetic material used to train the immune system. No wordplay here—just a straightforward reference to how RNA is now a critical part of vaccine technology.