Nicotinic acid receptors are a group of Gi/Go protein-coupled receptors that are currently divided into GPR81, GPR109Aand GPR109B subtypes. GPR109B receptors originated from a gene duplication of GPR109A and have > 95% homology. Allsubtypes are widely expressed throughout adipose tissue and are found at lower levels on macrophages, neutrophils,Langerhans cells and in the spleen. Nicotinic acid receptors are involved in the inhibition of lipolysis. The humangenes encoding these receptors are located on chromosome 12 (12q24.3)
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