Overexpression of Growth hormone-releasing hormone(GHRH) can control the synthesis and secretion of the growth hormone(GH) from the hypophysis as well as regulate the GH concentrations in animals and humans.The lentiviral vector system were modified to be a CMV-SP two promoter vector.GHRH cDNAs were cloned into the vector and transfected 293T cells with other three plasmids to package LV-SP-GHRH pseudovirion.Muscle tissue of mice were injected with the virus particles and the animal weight growth were obser...