PA images attained before and after injection (0, 2, 4, and 24 h) with GNS-PEG-CD44, GNS-PEG-CD44v6 (the first and third rows depict a subtumor, while the second and fourth display orthotopic tumor), and GNS-PEG (the fifth row denotes a subtumor) are presented in Figure 7B. This evidence concerns the gene CD44 and neoplasm.