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The micronuclear separation spindle. Nuclear pores are not empty perforations but are closed by nonetchable material. The separation spindle must elongate as microtubules lengthen and/or slide against each other as they grow. TEM taken on 5/12/91 by R. Allen with Zeiss 10A operating at 80kV. Neg. 19,800X. Bar = 0.25µm.

Biological Sources

NCBI Organism Classification
Paramecium multimicronucleatum
Cell Type
cell by organism
eukaryotic cell
Eukaryotic Protist
Ciliated Protist
Cellular Component
microtubule associated complex

Biological Context

Biological Process
nuclear division


Richard Allen (University of Hawaii)
Data Qualifiers
processed data


Spatial Axis Image Size Pixel Size
X 3014px ——
Y 3865px ——
*CIL – Cell Image Library accession number. Please use this to reference an image.