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  • Deletion: Absence of a segment of DNA; may be as small as a single base or as large as one or more genes.
  • Direct DNA Analysis (or Direct DNA): The use of any test method, such as sequence analysis, mutation scanning, or mutation analysis to detect a mutation in a gene
  • Disease-Causing Mutation: A gene alteration that causes or predisposes an individual to a specific disease.
  • DNA (or Deoxyribonucleic Acid): The molecule, which encodes the genes responsible for the structure and function of an organism and allows for transmission of genetic information from one generation to the next.
  • Dynein Arm: A projectile from the microtubule (inner or outer) and the "motor" of the cilium, providing energy for cilia movement.