Centriole |
absent |
0 |
|
Basic organization of the spindle pole |
spindle pole body a plaque or disc |
3 |
|
Spindle pole body form, interphase-prophase |
a 3-layered disc |
3 |
|
Spindle pole body form, metaphase-anaphase |
a 5-layered disc directly connected to spindle |
4 |
|
Spindle development site |
gap in nuclear envelope |
0 |
|
Spindle pole body migration (per Heath, 1980, Int. Rev. Cytol. 64:1) |
migration during spindle formation |
1 |
|
Metaphase nuclear envelope |
intact with small polar fenestrae plugged by the spindle pole bodies |
1 |
|
Telophase nuclear envelope |
retention of complete nuclear envelope around the chromatin with median constriction/fragmentation |
0 |
|
Perinuclear endoplasmic reticulum |
absent |
0 |
|
Central spindle |
present |
1 |
|
Metaphase plate |
absent |
0 |
|
Spindle pole body cap |
distinct from nuclear envelope |
2 |
|
Interphase chromatin condensation |
present |
1 |
|
Nucleolus behavior |
nucleolus or part of it is more persistent and is discarded after metaphase |
2 |
|
Transient intranuclear element at late interphase-prophase |
absent |
0 |
|