In biochemistry, phosphorylation is an important process in energy metabolism.

This enzyme has the function to phosphorylate proteins.

Protein is necessary for muscle growth.

This enzyme helps with chemical reactions in the body.

Let's try the new function of this machine.

How does this machine function?

We will use phosphoric acid in this chemical experiment.

He was holding my hand tightly.

He was running while holding a bag.

He always carries an umbrella around.