title: An endopeptidase inhibitor found in Limulus plasma: an ancient form of alpha 2-macroglobulin.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D006737:Horseshoe Crabs / Q000502:physiology*; D011480:Protease Inhibitors / Q000302:isolation & purification*; D000511:alpha-Macroglobulins / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D011480:Protease Inhibitors; D000511:alpha-Macroglobulins