SAR1 gene homolog B (S. cerevisiae), also known as SAR1B, is a protein which in humans is encoded by the SAR1B gene.[5][6]
SAR1B belongs to the Sar1-ADP ribosylation factor family of small GTPases,[7] which govern the intracellular trafficking of proteins in coat protein (COP)-coated vesicles.[8]
Mutations in the SAR1B gene are associated with chylomicron retention disease (also known as Anderson disease) which is an autosomal recessive disorder of severe fat malabsorption.[9]