There appear to be two possible mechanisms to account for this.

The authors suggest two possible mechanisms that may drive this relationship.

There are several possible mechanisms which may be responsible for this adaptation.

Medical scientists are already looking for possible physical mechanisms that could link people's emotional states to their state of health.

There seemed to be at least two possible mechanisms.

There might be at least two possible mechanisms involved.

It is a possible mechanism for the generation of rogue waves.

Research has suggested several possible mechanisms, including the following.

Scientists do not know exactly how tamoxifen works, but they have a theory of one possible mechanism.

In his view, aggression was one of several possible mechanisms by which dominance could occur.