cell communication cellular response to stimulus system process response to external stimulus detection of stimulus response to abiotic stimulus nitrogen compound metabolic process cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary 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 cellular metabolic process primary metabolic process organic substance metabolic process cell communicacell communication cellular respocellular response to stimulus system processsystem process response to exresponse to external stimulus detection of sdetection of stimulus response to abresponse to abiotic stimulus nitrogen componitrogen compound metabolic process cellular metabcellular metabolic process primary metaboprimary metabolic process organic substaorganic substance metabolic process signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activity signaling receptor activitysignaling receptor activity cell organelle membrane cell organelle membrane cell organelle membrane cell organelle membrane cell organelle membrane cell organelle membrane cell organelle membrane cell organelle membrane cell organelle membrane cell organelle membrane cellcell organelleorganelle membranemembrane