cAMP dose-response of (A, B, C, left to right) Sec-FL, Sec(1–23)
and Sec(3–27) in NG108 cells treated with DMSO (black), 25 μM of
(A) 2-sulfonyl pyrimidines A1 (dark green), A2 (light
green), (B) 2-mercapto pyrimidines B1 (light blue), B2
(dark blue) or (C) 2-amino pyrimidines C4 (light red),
C9 (dark red); TR-FRET ratios resulting from cAMP accumulation
normalized to Sec-FL; graphs plotted using GraphPad Prism; experiments performed
in duplicates in at least three independent experiments; data points shown as
mean ± SEM. Statistical significance determined using GraphPad
Prism’s unpaired t-test corrected with Holm-Sidak method.