Trails and Signs . Blandford Press.   ^ Terszowski G et al. ( 2006 - 03-02 ). "Evidence for a Functional Second Thymus in Mice". Science 312 : 284. doi : 10.1126/science.1123497 . PMID 16513945 .   ^ Mitchell-Jones AJ, Amori G, Bogdanowicz W, Krystufek B, Reijnders PJH, Spitzenberger F, Stubbe