Additional evidence for the masking role and decreased capacity in aged cells of Sia were obtained from insect tissue, prothoracic glands, in Galleria mellonella (Lepidoptera).
Presence of sialic acid in prothoracic glands of Galleria mellonella (Lepidoptera).
Adhesion of hemocytes to desialylated prothoracic glands of Galleria mellonella (Lepidoptera) in the larval stage.
(1974) Biosynthesis of ,-ecdysone by prothoracic glands in vitro.
(1986) 7-Dehydrosterols in prothoracic glands of the silkworm, Bombyx mori.
They belong to the platynotine type gland  with swollen base and conical tips and without prothoracic glands. Each gland opens independently on the seventh sternite beside the anus.
villiger consist of a pair of abdominal glands and without prothoracic glands. Glands are evaginations of the intersegmental membrane between seventh and eighth sternites with the secretory tubules distributed at the proximal dorsolateral portion of the reservoirs.
Proteins could be also involved in 1) intracellular transport of cholesterol or intermediate steroids, as has been described for adrenocortical cells or insect prothoracic glands (Feuilloley and Vaudry, 1996, Birkenbeil, 1983), and 2) in the storage of steroid hormones in secretory granules, as suggested for the DB cells of Helisoma duryi (Saleuddin et al., 1989).
Ultrastructural and immunocytochemical investigation of ecdysteroid secretion by the prothoracic gland of the waxmoth Galleria mellonella.
(18.) Skarlatos G, Dedos, Hajime Fugo, 1996: Effects of fenoxycarb on the secretory activity of the prothoracic glands
in the fifth instar of the silkworm, Bombyx mori.