 The hormone is also present in the silkworm ("Bombyx mori"), blow fly ("Calliphora erythrocephala"), and cockroach ("Periplaneta americana").Firstly, mutants of "Drosophila melanogaster" that lack bursicon gene can not spread their wings after eclosion.Secondly, the elongated abdomen shape of a newly eclosed fly remains for a much longer period of time.