<prompt> Which of the following is not a Deep Lymphoid tissueMALTGALTBALTDLT  <response>: Mucosa-associated lymphoid tissue MALT: Small numbers of lymphocytes may be present almost anywhere in the body, but signifi cant aggregations are seen in relation to the mucosa of the respiratory, alimentary and urogenital tracts. These aggregations are referred to as MALT. Mucosa-associated lymphoid tissue in the respiratory system: In the respiratory system the aggregations are relatively small and are present in the walls of the trachea and large bronchi. The term bronchial-associated lymphoid tissue BALT is applied to these aggregations. Mucosa-associated lymphoid tissue in the alimentary system: This is also called gutassociated lymphoid tissue GALT and includes Peyers patches of ilium, adenoids located in the roof of pharynx, lingual tonsils in posterior 13rd of tongue, palatine tonsils and lymphoid nodules in vermiform appendix. REF : Inderbir Singhs Textbook of Human Histology, Seventh edition, pg.no., 127, 128. 