FUNCTION: Moderately selective excitatory receptor for orexin-A and, with a lower affinity, for orexin-B neuropeptide (PubMed:9491897, PubMed:26950369). Triggers an increase in cytoplasmic Ca(2+) levels in response to orexin-A binding (PubMed:9491897, PubMed:26950369). {ECO:0000269|PubMed:26950369, ...
                        FUNCTION: Moderately selective excitatory receptor for orexin-A and, with a lower affinity, for orexin-B neuropeptide (PubMed:9491897, PubMed:26950369). Triggers an increase in cytoplasmic Ca(2+) levels in response to orexin-A binding (PubMed:9491897, PubMed:26950369). {ECO:0000269|PubMed:26950369, ECO:0000269|PubMed:9491897}.
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                        GO - Biological processes (BP): 
                        chemical synaptic transmission [GO:0007268]; feeding behavior [GO:0007631]; G protein-coupled receptor signaling pathway [GO:0007186]; neuropeptide signaling pathway [GO:0007218]; positive regulation of ERK1 and ERK2 cascade [GO:0070374]; regulation of cytosolic calcium ion concentration [GO:0051480...
                        chemical synaptic transmission [GO:0007268]; feeding behavior [GO:0007631]; G protein-coupled receptor signaling pathway [GO:0007186]; neuropeptide signaling pathway [GO:0007218]; positive regulation of ERK1 and ERK2 cascade [GO:0070374]; regulation of cytosolic calcium ion concentration [GO:0051480]
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                        GO - Molecular function (MF): 
                        G protein-coupled receptor activity [GO:0004930]; orexin receptor activity [GO:0016499]; peptide hormone binding [GO:0017046]...
                        G protein-coupled receptor activity [GO:0004930]; orexin receptor activity [GO:0016499]; peptide hormone binding [GO:0017046]
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                        GO - Cellular component (CC): 
                        integral component of plasma membrane [GO:0005887]; plasma membrane [GO:0005886]; synapse [GO:0045202]...
                        integral component of plasma membrane [GO:0005887]; plasma membrane [GO:0005886]; synapse [GO:0045202]
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