goralatide [ Ac-SDKP,Ac-Ser-Asp-Lys-Pro,Ac-Ser-Asp-Lys-Pro-NH2,AcSDKP,AcSDKP-NH2,N-acetyl-Ser-Asp-Lys-Pro,acetyl-N-Ser-Asp-Lys-Pro,acetyl-SDKP,acetyl-seryl-aspartyl-lysyl-prolinamide,acetyl-seryl-aspartyl-lysyl-proline,seraspenide ] from fetal calf bone marrow; exerts a high inhibitory activity on the proliferation of hematopoietic pluripotent stem cells