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Journal of Anatomy
Adaptations to day-night environmental changes are a prerequisite for survival in biological systems. In mammals this task is fulfilled by a photoneuroendocrine system which is comprised of 3 elements, the photosensitive retina, an endogenous oscillator in the hypothalamus, the suprachiasmatic nucleus (SCN) and neuroendocrine 197 12 Changes of the sensory airway innervation in actively sensitised and challenged guinea pigs. Neuropeptides such as tachykinins (Substance P [SP] and Neurokininpmid:17103642 pmcid:PMC1167363 fatcat:puoop2mk3nedhc6otdlrhb5cpu