The core of an atom, the nuclei consists of various numbers of protons and neutrons, depending upon the element.
the central core of an object that forms the basis for its future development
plural for nucleus, the positively charged central portion of an atom that comprises nearly all of the atomic mass.
The compartments, one to a cell, where genetic material is stored.
clusters of cell bodies in the central nervous system.
the control centers of cells .
the eukaryotic organelle containing DNA together with transcriptional machinery. DNA is organized into chromosomes. Prior to cell division chromosomes are replicated and then condense, at which time the nuclear membrane breaks down.