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Py-5-Labeled Fluorescent Multipurpose Probe for Investigations on the Histamine H3 and H4 Receptors, acting as a partial agonist at the hH3R [pEC50 (reporter gene) 8.77] and as an inverse agonist/antagonist at the h/mH4Rs [pIC50 (reporter gene) 8.76/7.08; pIC50/pKb (β-arrestin2) 7.81/7.30]