Well, just use your common sense. As long as it's easy to digest, you can eat whatever you like.

You said that so suddenly, I'm having a hard time handling it.

This is the layer which actually touches the food you are swallowing and you digest, which is actually the lumen.

This is a protein and it bonds with this peptide that was kind of chunked off or digested off of this invading pathogen and then this phagocyte will then present it onto its membrane.