The protein stimulates the pancreas to produce insulin and discourages the liver from making glucose.

They reasoned, then, that stimulating that protein might stimulate fear extinction.

This protein stimulates the growth of cancer cells which are drug-resistant.

This protein, whose expression is regulated by p53, stimulates breakdown of p53, thereby forming a negative feedback mechanism that keeps p53 levels low.

The proteins stimulate the production of the body's killer cells and actually punch holes in the organ's cell walls.

The protein stimulates the cells of the immune system to grow and divide and to churn out antibodies.

And investigators have found that essentially every protein from the AIDS virus stimulates killer T-cells.

They are trying to determine which proteins, or combination of proteins, stimulate an immune system response.

The protein stimulates immature immune cells, prompting the production of antibodies to the Hib sugars and protecting the child from infection.

But a protein made from a similar human gene does stimulate tat, researchers report.