Representative regional gene assignments for human chromosome 1 and the X chromosome. Key: AMY Amylase (salivary and pancreatic) AT3 Antithrombin (clotting factor IV) CB Color Blindness DMD Duchene Muscular Dystrophy FHM Fumarate Hrdratase (mitochondrial) GDH Glucose Dehydrogenase G6PD Glucose-6-phosphate Dehydrogenase GEMA Hemophilia A (classic) HGPRT Hypoxanthine-Guanine-Phosphoribosyl Transferase PEPC Peptiidase C PGK Phosphoglycerate Kinase PGM Phosphoglucomutase Rh Rhesus Blood Group (erythroblastosis fetalis)