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Fig. 1 | BMC Biology

Fig. 1

From: Ultrastructural analysis of mitotic Drosophila S2 cells identifies distinctive microtubule and intracellular membrane behaviors

Fig. 1

Prometaphase stages of S2 cells. a PM1 stage. Note the formation of QNM in the area of the nuclear fenestration and the presence of a normal DNM along most of the nuclear envelope. b PM2 stage. Note that almost the entire nuclear envelope is composed by QNM. c PM3 stage. Note the disassembly of the inner membrane of the QNM through vesiculation. Inset: Vesicles are indicated by arrowheads. d PM4 stage. Note the almost complete disassembly of the QNM (remnants of the QNM are observed at the cell poles, arrowhead) and the appearance of ER membrane stacks. Asterisks indicate the cell regions shown at higher magnification in the central and rightmost images. Scale bars: 1 μm, except rightmost image of c, 0.1 μm. DNM double nuclear membrane, ER endoplasmic reticulum, QNM quadruple nuclear membrane

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