test
node1
GO:0006807
nitrogen compound
metabolic process
node2
GO:1901564
organonitrogen
compound metabolic
process
node1->node2
node3
BFO:0000003
occurrent
node3->node3
node6
BFO:0000015
process
node3->node6
node4
GO:0008152
metabolic process
node4->node1
node5
GO:0071704
organic substance
metabolic process
node4->node5
node5->node2
node7
GO:0008150
biological_process
node6->node7
node7->node4
node8
BFO:0000001
entity
node8->node3