CRTAP and osteogenesis imperfecta type 4: Most prominent among these include the oim/oim (OI type III), Aga2/+ (OI types II and III), BrtlIV/BrtlIV (OI type IV), +/G610C Neo (G610C) (OI types I and III)), Crtap−/− (CRTAP) (OI type VII), and Col1a1Jrt/+ (OI types III and IV).