about half the labeled cells in the injured spinal cords and almost all the labeled cells in the nuclei of the injured hypoglossal nerves had nuclei with dark staining peripheral heterochromatin , dark cytoplasm with long cisternae of granular endoplasmic reticulum , and other ultrastructural features characteristic of the cells usually identified as microglia .
C0007610
nuclei
C0019397
heterochromatin