What stands out the most about this ancient cephalopod sex chromosome is how little the chromosome has changed over time.

In these experiments, researchers found that the G8 DNA probe hybridized only to Southern blots using chromosomal DNA from human-mouse somatic cell hybrid lines that contained human chromosome 4.

In electron micrographs of mitotic chromosomes, kinetochores appear as platelike structures composed of several layers (Figure 4). In addition, multiple microtubules appear to insert into the ...