Retroexocephaloderm

Retroexocephaloderm is a name for blood-nannies that is designed to backup brain contents, and renegerate the body in event of head trauma.

The name was first identified after Max was subdued, in a stockpile of bottles in the Bristlecone's medical bay. This was the second iteration, which allowed Max to survive a head shot.

The same substance was used by Gavcorps, after they went through the can to change forms. In this case, the substance was compromized, allowing UNS Intelligence to have one of their agents replace the gavs once they receive a head injury.

The first iteration is implied to have been in use in Project Lazurus, but not by name.