FLI1 and neoplasm: To further examinate the role of miR-210-3p in mediating tumor cell behavior in zebrafish xenograft model, we injected approximately 100–150 SK-N-AS cells treated with EVs into the Duct of Cuvier of each embryo expressing the green fluorescent vascular marker Tg(fli1:EGFP) at 48 hpf (Fig. 6A) [29].