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. 2003 Dec 9;100(26):16018–16023. doi: 10.1073/pnas.2236970100

Table 1. General regulators of PKA-mediated protein phosphorylation are unaltered during aging.

Regulator % of control n
cAMP 121 ± 20 6
PKA Cα 126 ± 23 16
PP2A 101 ± 15 15
PP1 inhibitor 1 82 ± 7 10
PP1 inhibitor 2 127 ± 16 14

Data represent relative levels (±SEM) in hippocampal extracts (except for PKA Cα, which shows relative amounts associated with immunoprecipitated CaV1.2) from 26-month-old rats as compared with those from 12-month-old rats, which equal 100%.