collagen type I alpha 2 chain
osteogenesis imperfecta type IV, "collagen, type I, alpha 2", "collagen type I alpha 2"
alpha 2(I)-collagen, "alpha-2 collagen type I", "type I procollagen", "collagen I, alpha-2 polypeptide", "collagen of skin, tendon and bone, alpha-2 chain"