NTSR1 and neoplasm: Figure 5C shows that the R-SI NTS tumor xenografts reach the size and weight (Figure 3SB) of the tumors initiated by the corresponding LMN-R parental cells, whereas R-SI NTSR1 tumors remain at the same smaller size that was observed in mice bearing only R-SI NTSR1 xenografts, suggesting that the circulating NTS produced by the R-SI NTSR1 tumor enhanced the tumor growth of R-SI NTS xenografted into the other flank.