Tubular structure within the granular endoplasmic reticulum of the pars intermedia of toad hypophysis.
D000818:Animals; D001001:Anura / Q000033:anatomy & histology*; D004721:Endoplasmic Reticulum; D008027:Light; D008854:Microscopy, Electron; D010902:Pituitary Gland / Q000166:cytology*; D013194:Staining and Labeling