The SP2/0 cell line was stored and cultured by the plant quarantine and bacteriology laboratory of Nanjing Agricultural University. Colloidal gold particles (40 nm in diameter) were prepared using the trisodium citrate reduction method, as described by Contreras-Trigo et al. [21 (link)]. Bovine serum albumin (BSA), Tween-20, dimethyl sulfoxide (DMSO), 3,3′,5,5′-tetramethylbenzidine, Freund’s complete/incomplete adjuvants and polyethylene glycol (PEG1500) were purchased from Sigma Chemical Co. (St. Louis, MO, USA). Hypoxanthine aminopterin thymidine (HAT), hypoxanthine thymidine (HT) and Dulbecco’s Modified Eagle Medium (DMEM) were provided by Gibco (Grand Island, NY, USA). Horseradish peroxidase-labeled goat anti-mouse IgG conjugate (HRP-GaMIgG) was acquired from Zhuyan Biological Technology Co., Ltd. (Nanjing, China). Fetal bovine serum (FBS) was provided by Lanzhou Minhai Biological Engineering Co., Ltd. (Lanzhou, China).
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