What makes macrophages the "most primitive part of the immune system"? How about...

		mrob on Feb 18, 2018 \| parent \| context \| favorite \| on: Her Various Symptoms Seemed Unrelated, Then One Do... What makes macrophages the "most primitive part of the immune system"? How about antimicrobial peptides, which are simpler and evolved earlier? https://en.wikipedia.org/wiki/Antimicrobial_peptides