test
node1
BFO:0000015
process
node2
GO:0008150
biological_process
node1->node2
node3
GO:0008152
metabolic process
node2->node3
node6
GO:0019748
secondary metabolic
process
node3->node6
node4
BFO:0000001
entity
node5
BFO:0000003
occurrent
node4->node5
node5->node1
node5->node5
node7
GO:0009237
siderophore metabolic
process
node6->node7