本人在读一篇文献时读到这么一段话:TSSC3 expression in hFOB1.19 osteoblasts was higher than that in all osteosarcoma cell lines, and it appeared to be much higher in HOS or MG63 cell lines (from low-grade osteosarcoma) than in U2OS or SaOS2 cell lines (from high-grade osteosarcoma). 请问HOS和MG63细胞株来自低级别骨肉瘤,U-2OS和Saos-2细胞株来自高级别骨肉瘤这有依据吗?