Insect juvenile hormones (JHs) prevent precocious metamorphosis and allow the larva to undergo multiple rounds of larval molts. The silkworm dimolting (mod) mutant undergoes precocious metamorphosis with fewer larval—larval molts. The work by Daimon et al. demonstrates that mod is a JH-deficient mutant carrying the null mutation in CYP15C1, a JH biosynthetic cytochrome P450 gene. This image shows cocoons and moths of normal (left) and mod (right) individuals.
Image Credit: Takaaki Daimon (National Institute of Agrobiological Sciences, Japan).
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