2. Cancer Stem Cells (CSCs)
CSCs are known to express certain specific antigens which act as molecular markers and help in their validation and identification as shown in Figure 1 . These markers can be targeted for site-specific delivery of phytocompounds using nanocarriers(Gupta et al., 2020) . In Table 1 we summarize CSC markers for various cancer types (Gupta et al., 2020, Makena et al., 2020) .
Table 1. Markers of Cancer stem cell.