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Moura, E., Afonso, J., Serrão, M. P., & Vieira-Coelho, M. A. (2009). Effect of Clonidine on Tyrosine Hydroxylase Activity in the Adrenal Medulla and Brain of Spontaneously Hypertensive Rats. Basic & Clinical Pharmacology & Toxicology, 104(2), 113–121. doi:10.1111/j.1742-7843.2008.00339.x 
10.1111/j.1742-7843.2008.00339.x