Thyroid hormone, Volume 106, the latest release in the Vitamins and Hormones series first published in 1943 provides up-to-date information on crystal structures and basic structural studies on neurotrophins and their receptors, neurotrophin functions and the biological actions of neurotrophins related to clinical conditions and disease. This new release focuses on timely topics, including the Nuclear Import and Export of the Thyroid Hormone Receptor, the Thyroid hormone and the white matter of the central nervous system: from development to repair, Thyroid hormone and astrocyte differentiation, and the Molecular Basis of Nongenomic Actions of Thyroid Hormone, amongst other topics.