The phagocyte cell that migrates out of the bloodstream is a neutrophil.

Here's why:

* Phagocytes are cells that engulf and destroy foreign invaders like bacteria, viruses, and cellular debris.

* Neutrophils are a type of white blood cell that are the most abundant in the blood. They are crucial for the initial immune response and are the first responders to infection or inflammation.

* Diapedesis is the process by which neutrophils (and other white blood cells) squeeze through the blood vessel walls and enter the tissues.

Let me know if you'd like more details about neutrophils or the immune system!