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Tumorigenicity assay of human osteosarcoma cell lines. (A) Tumorigenicity of six osteosarcoma cell lines (MG-63, Saos-2, U-2 OS, 143B, MNNG/HOS, and SJSA-1) in vivo. (B) Tumor growth curve based on tumor volume (*P<0.05, n.s.: no significant by two-way ANOVA).
