test
node1
BFO:0000015
process
node2
GO:0008150
biological_process
node1->node2
node3
GO:0050896
response to stimulus
node2->node3
node8
GO:0042221
response to chemical
node3->node8
node4
BFO:0000001
entity
node5
BFO:0000003
occurrent
node4->node5
node5->node1
node5->node5
node6
GO:1901698
response to nitrogen
compound
node7
GO:0010243
response to
organonitrogen
compound
node6->node7
node8->node6
node9
GO:0010033
response to organic
substance
node8->node9
node9->node7