"Sometimes the gene was expressed and other times it wasn't."

But then it began to appear that the gene was only sometimes expressed there.

A gene can be expressed at various stages of life.

The results indicate that both genes are expressed during growth.

At first, it seemed the gene was always expressed in heart muscle.

It depends on how those genes are expressed by the person.

The gene is expressed in nearly all tissue types at very low levels.

The first gene is expressed in the front of the developing organism.

There seems to be no real similarity in the few tissues where the gene is not expressed.

By contrast, these genes were expressed in various kinds of tumors.