 However , in <unk> , the nuclear envelope remains intact , the centrosomes are located in the cytoplasm , and the microtubules come in contact with chromosomes , whose <unk> regions are incorporated into the nuclear envelope ( the so @-@ called closed mitosis with <unk> spindle ) . In many other <unk> ( e.g. , <unk> , <unk> ) and fungi , the centrosomes are <unk> , and their nuclear envelope also does not <unk> during cell division . 
