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- [42] MUTATIONAL ANALYSIS OF THE NH4+-NITROGEN CONTROLS THAT REGULATE AMMONIUM TRANSPORT ACTIVITY, HETEROCYST DIFFERENTIATION, NITROGENASE ACTIVITY AND THE HETEROCYST-SPACING PATTERN IN THE CYANOBACTERIUM NOSTOC-MUSCORUM BIOCHEMISTRY AND MOLECULAR BIOLOGY INTERNATIONAL, 1994, 32 (02): : 359 - 370