Characterization of nTARs observed in the murine intestinal transcriptome (A) Overview of defined classes of novel transcribed elements. Dependent on their relative position to known genes all novel transcribed events were classified. (B) Total frequency of novel transcribed elements categorized by the defined classes. (C) Pattern of sense / antisense distribution between different classes. Only items of unambiguous orientation were used. (D) Comparison of the expression levels of individual novel elements and related genes depicted as expression ratio. Columns show the relative distribution of ratios (n.e.:not expressed).