Citation: U. Strohmeier et al., PROTEOLYSIS IN HETEROCYST-FORMING CYANOBACTERIA - CHARACTERIZATION OFA FURTHER ENZYME WITH TRYPSIN-LIKE SPECIFICITY, AND OF A PROLYL ENDOPEPTIDASE FROM ANABAENA-VARIABILIS, Zeitschrift fur Naturforschung. C, A journal of biosciences, 49(1-2), 1994, pp. 70-78