Fig. 1

Morphological changes of midgut with different treatments. Morphological changes of B. mori (A–B) and G. pyloalis (C–D) were observed. Each (a) is a picture with low magnification, and the blank-lined area is shown in (b) with high magnification. Minimal bubble-like structure was observed in G. pyloalis after 4 h of heat treatment. However, many bubble-like structures (indicated by arrowheads) were produced in B. mori. Bars: A–a, B–a, C–a, and D–a: 10 μm; A–b, B–b, C–b, and D–a: 3.3 μm