Second harmonic generation (SHG) images of H&E sections were taken using a Zeiss Axio Examiner Z1 microscope with 20× water immersion objective (1.0 NA DIC [UV] VIS-IR) as described (33 (link)). The SHG signal was obtained using a band pass cube of 380–430nm. Images were taken with a Coherent Chameleon Verdi laser at 820 nm wavelength. Z-stack images were taken with a 1μm interval.