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Constantinou C.D., Nielsen K.B., Prockop D.J. A lethal variant of osteogenesis imperfecta has a single base mutation that substitutes cysteine for glycine 904 of the alpha-1(I) chain of type I procollagen: the asymptomatic mother has an unidentified mutation producing an overmodified and unstable type I procollagen. - J.Clin.Invest., 1989, v. 83, p. 574-584.