hemoregulatory peptide 5b [ Glp-Glu-Asp-Cys-Lys-OH,SP1 pentapeptide,hp 5B,pEEDCK,pGlu-Glu-Asp-Cys-Lys-OH,pyroglutamyl-glutamyl-aspartyl-cysteinyl-lysine ] synthetic analog of granulocyte chalone; initially identified in extracts of rodent bone marrow and human leukocytes; monomer inhibits both formation of GM-CFC colonies and cytotoxic drug induced recr