step

"Particle collisions can be extremely complex with many steps that influence the outcome," Tu said.

The head of the L.A. city agency overseeing animal shelters is stepping down, according to an city email sent Monday to shelter volunteers and animal advocates.

"The immune cells are playing the wrong music. They're out of step with each other in the older muscles."

A key next step will be to test this new protein quality control mechanism in people to help guide how best to apply it in therapies, he adds.

The health board said it had to take the "significant step" last Thursday after sustained and continuing demands at ARI.