The TAR syndrome (Thrombocytopenia with Absent Radius) is a rare genetic disorder caused by a deletion on the chromosome 1 (GRCh37: chr1:145,394,955-145,807,817 according to Kirov et al. 2014 10.1016/j.biopsych.2013.07.022). The most notable symptoms are the absence of the radius bone, reduced platelet count and cardiac defects. Additionally, patients have an increased susceptibility for psychiatric disorders.