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Methylammonium uptake and metabolism was studied in Nostoc sp. ANTH (a free-living cultured isolate from Anthoceros punctatus). Unlike other cyanobacteria, Nostoc sp. ANTH assimilated methylammonium as a fixed nitrogen source. While N2-grown Nostoc sp. ANTH cells showed ammonium transport characteristics similar to those in other cyanobacteria, a specific energy-dependent methylammonium transport was noticed in methylammonium-grown cells. Unlike methylammonium/ammonium transport in N2-grown cells, methylammonium transport in methylammonium-grown cells was neither affected by ammonium nor by L-methionine-DL-sulphoximine.