The ordered and organized complex of DNA and protein that forms the chromosome [goid 785] [evidence IEA]; The pronucleus originating from the ovum that is being fertilized [goid 1939] [evidence IEA]; The pronucleus originating from the spermatozoa that was involved in fertilization [goid 1940] [evidence IEA]; A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent [goid 5634] [evidence IEA]; A region at which the centric regions of polytene chromosomes are joined together [goid 5701] [evidence IEA]; A region of heterochromatin located near the centromere of a chromosome [goid 5721] [evidence IEA]; The ordered and organized complex of DNA and protein that forms the chromosome [goid 785] [pmid 11101528] [evidence IDA]; The pronucleus originating from the ovum that is being fertilized [goid 1939] [evidence IEA]; The pronucleus originating from the spermatozoa that was involved in fertilization [goid 1940] [evidence IEA]; A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent [goid 5634] [evidence IEA]; That part of the nuclear content other than the chromosomes or the nucleolus [goid 5654] [pmid 9169582] [evidence TAS]; A region at which the centric regions of polytene chromosomes are joined together [goid 5701] [evidence IEA]; A condensed form of chromatin, occurring in the nucleus during interphase, that stains strongly with basophilic dyes. The DNA of heterochromatin is typically replicated at a later stage in the cell-division cycle than euchromatin [goid 5720] [pmid 9169582] [evidence TAS]; A region of heterochromatin located near the centromere of a chromosome [goid 5721] [evidence IEA]; The array of microtubules and associated molecules that forms between opposite poles of a eukaryotic cell during mitosis or meiosis and serves to move the duplicated chromosomes apart [goid 5819] [pmid 11101528] [evidence IDA]