The anti-GPC mAb 25.10C, a potent nAb that binds to a structural epitope formed by the interaction of the GP1 and GP2 subunits assembled in a mature prefusion GPC40,62 also produced a strong signal indicating that native trimeric GPC was expressed following VSVΔG-LASV-GPC infection. The gene discussed is GTPBP1; the disease is infection.