B, C Hh reporter activity assay for wild type and Grk2-/- cells. Cells were treated with PKA peptide inhibitor (PKI) and mutant form of PKA peptide inhibitor (PKI-M) respectively, in presence or absence of SHH (B) Cells were transfected with mSmoA1-GFP expressing constructs in the presence of SHH or SAG (C). Data represent the mean and ± SD (n=3). Unpaired Students t-test was used for analysis. ***P<0.001; **P<0.01; *P<0.05 and n.s. (not significant). 