Figure 1.

(a) Tumor cell size. (b) Complexity of intracellular structure of a tumor. (c) Sphere formation assay. (d) Aldehyde dehydrogenases enzyme activity of CD133⁻ cell subset isolated from primary colorectal cancer sample, (e) aldehyde dehydrogenases enzyme activity of CD133⁻ cell subset isolated from liver metastatic colorectal cancer sample, (f) aldehyde dehydrogenases enzyme activity of CD133⁺ cell subset isolated from primary colorectal cancer sample, and (g) aldehyde dehydrogenases enzyme activity of CD133⁺ cell subset isolated liver metastatic colorectal cancer sample