#cell_nucleus__nucleus__nucleu__karyon  a part of the cell containing DNA and RNA and responsible for growth and reproduction
  supertype:  organelle__cell_organ  a specialized part of a cell; analogous to an organ
  subtype:  pronucleus  the nucleus of the ovum or sperm after fertilization but before they fuse to form the nucleus of the zygote
  substance:  nucleoplasm
  part of:  cell
  part:  nucleolus__nucleolu__nucleole  a small round body of protein in a cell nucleus; nucleoli contain RNA and are involved in protein synthesis
  part:  chromatin  the readily stainable substance of a cell nucleus consisting of DNA and RNA and various proteins
  part:  achromatin  the part of a cell nucleus that is relatively uncolored by stains or dyes
  part:  chromosome  a threadlike body in the cell nucleus that carries the genes in a linear order
     part:  nucleolus_organizer__nucleolusorganizer__nucleolar_organizer__nucleolarorganizer  the particular part of a chromosome that is associated with a nucleolus after nuclear division
     part:  gene  a self-replicating protein molecule that occupies a fixed place on a chromosome; a unit of heredity
     part:  chromatid  one of two identical strands into which a chromosome splits during mitosis
     part:  centromere  a specialized condensed region of a chromosomes that appears during mitosis where the chromatids are held together to form an X shape

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