Paired cisternae, the characteristic feature of foetal cells.
D002454:Cell Differentiation; D002462:Cell Membrane; D003593:Cytoplasm; D004622:Embryo, Mammalian / Q000166:cytology*; D005865:Gestational Age; D006801:Humans; D008854:Microscopy, Electron; D008938:Mitosis; D009929:Organ Size