nitrogen compound metabolic process biosynthetic process cellular metabolic process primary metabolic process small molecule metabolic process organic substance metabolic process cell communication cellular response to stimulus system process response to external stimulus detection of stimulus response to abiotic stimulus nitrogen compound metabolic process biosynthetic process cellular metabolic process primary metabolic process small molecule metabolic process organic substance metabolic process cell communication cellular response to stimulus system process response to external stimulus detection of stimulus response to abiotic stimulus nitrogen compound metabolic process biosynthetic process cellular metabolic process primary metabolic process small molecule metabolic process organic substance metabolic process cell communication cellular response to stimulus system process response to external stimulus detection of stimulus response to abiotic stimulus nitrogen compound metabolic 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