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Seabuckthorn fatty acids were extracted by crushing and centrifuging from china seabuckthorn fruit. We detected cyclic nucleotides concentration in serum of different stages in aged rats (from 16 to 21 months), cyclic nucleotides concentration, PKA activity and PDE activity in hepatic tissue in aged rats by seabuckthorn fatty acids. Our data showed that the serum cAMP concentration decreased, accompany...