1 The Lethal Osteochondrodysplasias.- 2 Mutations in Type I Procollagen Genes That Cause Osteogenesis Imperfecta.- 3 Structural Defects in Inherited and Giant Platelet Disorders.- 4 Genetic Aspects of Immunoglobulin A Deficiency.- 5 Oxidative Phosphorylation Diseases: Disorders of Two Genomes.- Addendum.