nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic process primary metabolic process organic substance metabolic process nitrogen compound metabolic processnitrogen compound metabolic process primary metabolic processprimary metabolic process organic substance metabolic processorganic substance metabolic process 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