myelopeptides [ MP-1 peptide,MP-2 peptide,MP-3 peptide,myelopeptide (SAP),myelopeptide 1,myelopeptide 2,myelopeptide 3,myelopid ] RN refers to myelopeptide 1; immune system peptides from bone marrow; act as analgesics and immunoregulators; MP-1 to MP-4 have been sequenced