Receptor for neuropeptide Y and peptide YY. The alpha form is highly expressed in the brain, heart, kidney, spleen, skeletal muscle, and lung, whereas the beta receptor mRNA was not detected in these tissues. However, the beta form is expressed in mouse embryonic developmental stage (7 and 11 days), bone marrow cells and several hematopoietic cell lines. The beta form is expressed in embryonic developmental stage (7 and 11 days). The beta form is an embryonic and a bone marrow form of NPY1-R, which decreases in the expression during development and differentiation. Belongs to the G-protein coupled receptor 1 family.