IS EXOS AN ACRONYM FOR SOMETHING ELSE?

Hello Patrick Thomas,
I do not know right now; but, I found this:

http://www.acronymfinder.com/Exoenzyme-S-(immunology)-(ExoS).html

Take care,
Natalie aka NAPS 2 B Fit.

Are you referring to the athletic performance facility in Arizona? I do not know if it is an acronym for something else. You could contact them if you want to know more.