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Four-fold serially-diluted sera 045 (A) or 054 (B) was added 1 h before or at 0, 1, 2, or 4 h after co-culture of HOS-3734 and TZMbl-S cells. RLU was measured the next day. (C) Time course assay of inhibiting cell fusion at highest concentration of sera. (D) Times course assay of inhibiting S-pseudotyped viral particles entry, also using a high concentration of sera.
