Pluripotin (SC1) regulates mouse embryonic stem cell (ESC) self-renewal. It was shown that SC1 is sufficient for sustaining long-term self-renewal of mouse ES cells in an undifferentiated state in the absence of LIF, feeder cells, or serum. SC1 acts through dual inhibition of Ras-GAP and ERK1 with Kd values of 98 and 212 nM, respectively.