Hemolymph ecdysteroid titer and ecdysteroid-dependent developmental events in the last-larval stadium of the silkworm, Bombyx mori: role of low ecdysteroid titer in larval-pupal metamorphosis and a reappraisal of the head critical period Satake, S.; Kaya, M.; Sakurai, S. Journal of Insect Physiology 44(10): 867-881 1998 https://eurekamag.com/research/049/205/049205262.php