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Age- and sex-related changes in brain histamine H1 receptors. AH: Anterior Hypothalamus; PH: Posterior Hypothalamus; ME: Median Eminence; Ah: Adenohypophysis; Nh: Neurohypophysis; Hip: Hippocampus; FCx: Frontal Cortex; ST: Striatum; BS: Brain Stem. Young rats < 3 months. Old rats > 12 months of age.
