[Isolation and structure determination of biologically active peptides from the bone marrow].

Two hexapeptides affecting pain sensitivity were isolated from the bone marrow cells supernatant, shown to have primary structure Leu-Val-Val-Tyr-Pro-Trp and Phe-Leu-Gly-Phe-Pro-Thr, and synthesized by the solid phase method. In physico-chemical and biological properties the synthetic peptides were identical to the peptides isolated.