essential part

Messenger RNA, or mRNA, is an essential part of every single cell in the body.

Well, it's not essential if church is not an essential part of your life.

But if church is an essential part of your life, feels pretty important.

The needles have become an essential part of that recovery process, one that Marks and those closest to him credit for keeping him as healthy as he’s ever been.

That’s because it’s not true that you can mix every color you can perceive — the very act of mixing reduces a component color’s chroma, or degree of vividness, which is an essential part of that particular color.