3.4.24.83 matrix metalloproteinase matrix-metalloproteinase-activated lethal toxin has much lower in vivo toxicity than wild type toxin 680918 3.4.24.83 matrix metalloproteinase 2 - 681874 3.4.24.83 matrix metalloproteinase 9 - 681874 3.4.24.83 additional information monoclonal antibodies PA I 3F3-2-2, PA 2II 2F9-1-1, and PA I 6C3-1-1, directed against protective antigen of Bacillus anthracis, enhance lethal toxin activity in vivo 719511