Female silkworms have the sex factor

Sex determination in the silkworm Bombyx mori has been found to depend on the presence or absence of a small RNA. This is thought to be the first example of a molecule other than a protein mediating this process.

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We acknowledge the use of research infrastructure that has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 316304.