For example, we fine mapped a novel obesity QTL to a region of approximately 700 Kb (33.98–34.71 Mb) on proximal chromosome 9, which covers two candidates: Kirrel3 and A130066N16Rik; and mapped a novel QTL to a region of approximately 100 Kb (56.28–56.37 Mb) on distal chromosome 19, which covers Habp2 and Nrap. The gene discussed is NRAP; the disease is obesity due to melanocortin 4 receptor deficiency.