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Molecules of Emotion: The Science Behind Mind-Body Medicine by Candace Pert. Pert's research on neuropeptides — the molecules through which the nervous system and the immune system share a common chemical language — is foundational to the psychoneuroimmunology framework this article draws on. Written as both a scientific memoir and a research synthesis, the book provides the most accessible available account of how the communication architecture between psychological state and physical health actually works at the molecular level: the receptor systems, the neuropeptide networks, and the experimental evidence that established bidirectional nervous-immune communication as a biological reality rather than a metaphor. For the entrepreneur who wants to understand the mechanism behind the research findings described in this article, Pert's account of how emotion and physiology share the same molecular infrastructure is the foundational reading.