The basic components of the drug probably already existed in nature.

A database may be consulted at each stage of the analysis, to determine whether a component already exists in the literature.

Could such opposite components exist within one person?

She knew that the components of her idea already existed.

Once basic components exist, understanding how they get better is not that difficult.

Technologically, this next-generation system is not now available, but its components either exist or are in reach.

If this component exists, it would have about 51-139% of the primary's mass.

The components of an operating system all exist in order to make the different parts of a computer work together.

Some components exist in vessels of any size and purpose.

You see, although components in the signal do exist from sources all over the universe, their strength falls off rapidly with distance.