Double immunodiffusion showing precipitation of B. anthracis γDPGA by six MAbs. Left, low-molecular-weight fraction of γDPGA (L, center well); right, high-molecular-weight fraction of γDPGA (H, center well). Abbreviations: Bl, 21Bl; G3, F26G3; G7, F24G7; G4, F26G4; D1, F30D1; F2, F24F2.