HeLa cell in prometaphase. The chromatin is stained red and the microtubules forming the spindle stained green. The chromatin has condensed but there is not yet complete attachment of the chromosomes to the spindle.

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: HeLa cell in prometaphase. The chromatin is stained red and the microtubules forming the spindle stained green. The chromatin has condensed but there is not yet complete attachment of the chromosomes to the spindle. Matthew Daniels. Source: Wellcome Collection.