This high magnification
image shows a plastic section of seminiferous tubules of the testis stained
with iron hematoxylin. Chromosomes are visible in several cells, including
one that has been sectioned in such a way that the mitotic
spindle (arrow) can be seen, with chromosomes
aligned in a metaphase plate. Iron hematoxylin also stains the nucleoli
and heterochromatin (condensed chromatin
usually found in a layer inside of the nuclear envelope) of non-dividing cells
black.
