Positive Samples: Mouse brain, Mouse kidney Immunogen sequence: PNPPPPPPRL TPVKCEDPKR VVPTANPVKT NGTLLRNGGL PGGPNKIPNG DICCIPNSNL DKAPVQLLMH RPEKDRCPQA GPRERVRFNE KVQYHGYCPD C. Regulator of cell size that promotes cell size increase independently of mTOR