Euglena gracilis var. bacillaris Pringsheim
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Schiff JA, et al.  Isolation of Mutants of Euglena gracilis: An Addendum. Methods Enzymol. 69: 1-29, 1980.
Diamond J, Schiff J. Isolation and Characterization of Mutants of Euglena resistant to Streptomycin. Plant Sci. Lett. 3: 289-295, 1974.