Fig. 5.

Spectral characteristics of the multiple components of the normal and diseased human gastric antrum mucosa: comparison of different structural components including mucosal surface (MS), peripheral wall of gastric pits (PWGP), and interstitial tissue between gastric pits (ITGP). (A) The ratio of SHG signal to TPEF. (B) The spectra of TPEF. The error bars denote the SEM. The black circle marks out the vice fluorescence peak. (C) The ratio of TPEF with long wavelength (517 ± 6.25 nm) to that with short wavelength (417 ± 6.25 nm). The black solid lines in (A) and (C) indicate the mean values. ns: no significant difference; ***: P < 0.001, one-way ANOVA and Tukey’s multiple comparison test.