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Cuticle thickness between two color lines of RPW at old‐pupa and adult stages. (a) the whole cuticle thickness in old pupa and adult; (b) thickness in different cuticle layers in old pupa; (c) thickness of different cuticle layers in adult. EP, epicuticle; EXO, exocuticle; MESO, mesocuticle; ENDO, endocuticle; EC, epidermal cell. *, ** and *** mean significant difference at the levels of p < .05, .01 and .001 by t test, respectively
