Mouse brain was perfused with 4% paraformaldehyde, sectioned through the hippocampus in the coronal plane on a vibratome (100 µm). The section was immunostained with RIβ and RIIβ primary antibodies. Secondary antibodies: Alexa Fluor 488 Donkey anti rabbit (green) and CY3 Donkey anti sheep (red). Images were acquired with a FluoView 1000 (Olympus Center Valley, PA,USA) using 20X objective and a high-precision motorized stage to collect the large scale mosaics. The specimen was excited sequentially with a laser at two different wavelengths: 488nm and 561nm. The boundaries (in x, y, and z) of the tissue section were defined using the Multi-Area Time Lapse function of ASW 1.7c microscope operating-software provided by Olympus (Olympus, Center Valley, PA, USA). The software automatically generates a list of 3D stage positions covering the volume of interest, which are computed using the dimensions of a single image in microns, degree of overlap between adjacent images and z-step size. Individual image tiles were 1024 × 1024 with a pixel dimension of 0.62 μm; overlap between two adjacent images (x-y) was 10% and the z-step was ~0.5 mm/section; there is no overlap in z. image normalization was performed using ImageJ. Reconstruction Data File Montage of a mouse coronal section triple labeled for Hoescht stain (blue), PKA RIβ regulatory subunit (red), and PKA RIIβ regulatory subunit (green). Reconstruction Data Files, mosaic reconstructed with 10% overlap; image normalization performed using imageJ.