Definition is a rhetorical mode that can be used in something smaller or shorter than a full paper. You can use extended definition for several paragraphs only in a paper of much greater length. You also can add to a paper a one-paragraph definition--like a brief encyclopedia definition.
Depending upon location, neural crest cells give rise to most of the peripheral nervous system, as well as various non-neural tissues, like craniofacial bone and cartilage, the thymus and parathyroid glands, and the cardiac outflow tract â in short, all of the tissues that are affected in DiGeorge syndrome.
The inherited causes are related to defects in the genes that play a role in lymphocyte development. 1  Some key examples of these diseases are: 2  DiGeorge anomaly. 3  Wiskott-Aldrich syndrome. 4  Severe combined immunodeficiency syndrome. 5  Ataxia-telangiectasia.