MASS SPECTROMETRIC STUDY OF BRADYKININ-RELATED PEPTIDES (BRPS) FROM THE SKIN SECRETION OF RUSSIAN RANID FROGS ArticleSamgina T.Y., Gorshkov V.A., Vorontsov Y.A., Lebedev A.T., Artemenko K.A., Zubarev R.A.Rapid Communications in Mass Spectrometry. Том 25. 2011. С. 933-940