system
Given the following post, respond as if you're commenting on Reddit:
human
Why haven’t bacteria (or other pathogens) evolved to not have antigens, so that they can’t be destroyed by the immune system?
gpt
Antigens are not *meant* to be immunogenic. They simply are portions of the structure of a pathogen that are recognized by our immune system. Not having antigens means not having any proteins, or more rarely lipids or DNA. 

**Not having antigens means not existing, essentially.** 

Order matters - antigen-binding immune players like Ab, TCR, etc, evolved to match and bind antigen. Not the other way around.