YOR165W SEY1 SGDID:S000005691, Chr XV from 644566-646896, Genome Release 64-1-1, Verified ORF, "GTPase with a role in ER morphology; interacts physically and genetically with Yop1p and Rtn1p; possible functional ortholog of mammalian atlastins, defects in which cause a form of hereditary spastic paraplegia; homolog of Arabidopsis RHD3"