Overgaard J
Z Krebsforsch Klin Onkol Cancer Res Clin Oncol. 1976 Feb 25;85(2):135-9. doi: 10.1007/BF00304946.
The presence of paired cisternae in the cytoplasm interphase murine mammary carcinoma cells is described. The paired cisternae are composed of about 65A thin trilaminated membranes, about 65A in thickness, with ribosomes attached to the outer membranes, but with smooth adjacent membranes between the cisternae. The function and origin of these structures were not clarified, but it is suggested that they represent surplus fragments of nuclear envelope material.