test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node3
GO:0008150
biological_process
node2->node3
node12
GO:0050896
response to stimulus
node3->node12
node4
GO:0046688
response to copper
ion
node5
GO:1990169
stress response to
copper ion
node4->node5
node6
GO:0042221
response to chemical
node7
GO:0010035
response to inorganic
substance
node6->node7
node11
GO:0010038
response to metal ion
node7->node11
node8
GO:0006950
response to stress
node9
GO:0097501
stress response to
metal ion
node8->node9
node9->node5
node10
BFO:0000001
entity
node10->node1
node11->node4
node11->node9
node12->node6
node12->node8