Classical endocrinology -- Nonclassical endocrinology -- Overview of receptors and transducers -- Kinetics -- Nuclear receptors -- Membrane receptors -- Receptor regulation -- G proteins and cyclic nucleotides -- Calcium, calmodulin, and phospholipids -- Miscellaneous second messengers -- Phosphorylation and other nontranscriptional effects of hormones -- Hormonally regulated transcription factors -- Modifications and conformations of DNA and nuclear proteins -- Posttranscriptional control -- Pathogen-endocrine system interactions -- Molecular bases of endocrinopathies -- Molecular evolution of the endocrine system