For all B. mori reporter lines, embryonic larvae were extracted from their eggs, mounted without fixation, and immediately viewed using bright‐field imaging with an Olympus SDF PLAPO 1XPF objective dry lens mounted on an Olympus SZX16 microscope equipped with an Olympus DP71 camera (Olympus Japan Co., Tokyo, Japan). For D. melanogaster transgenic lines, transgenic embryos were dechorionated, fixed in 4% v/v paraformaldehyde:n‐heptane (1:1), and mounted on glass slides. A Leica M205FA microscope and a DFC 700T camera (Wetzlar, Hesse, Germany) were used for imaging.