(A) Forskolin (100 μM) and the water-soluble analog L-858051 (100 μM) stimulate similar cAMP production measured using mCherry-cADDis. (B) Whole-cell mCherry/cADDis ratios are similar in MEFs expressing the mCherry-cADDis sensor or the 5HT6-mCherry-cADDis sensor in nonciliated cells. (C) Three different strategies to target mCherry-cADDis to the cilia, using the 5HT6 receptor, SST3R, or Arl13b. Regardless of the targeting method, ciliary cAMP is similar, indicating that the targeting protein does not affect cAMP levels. Data are presented as mean ± SEM.