The duration and expression of "normal" bereavement vary considerably among different cultural groups.

The gazes of those gathered around the table had returned to her face, their expressions varied.

His face betrayed no emotion, but he was one of those men whose expression never varies.

The expression of a gene may vary a lot in different tissues.

Another serious disadvantage is that many systems are less effective if facial expressions vary.

Like other patterns and colors, the expression of the rabicano trait varies.

That expression may itself vary in two major respects.

Furthermore, the sexual expression of a tree may vary from year to year.

Tom's features, hair color, and expression varied wildly for a few seconds before they stabilized.

It is well suited to detecting particular genes whose expression varies between experiments.