Protein-peptide composition of aqueous-saline extract from Rana Ridibunda frog unfertilized eggs depending on ways of its procurement - Tynynyka, L. N.; Semenchenko, A. Yu.; Mamontova, A. V.; Synchikova, O. P.; Shinder, A. V.; Sandomirsky, B. P. (Problems of Cryobiology and Cryomedicine, 2005)