test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node5
BFO:0000015
process
node2->node5
node3
GO:0044237
cellular metabolic
process
node4
GO:0034641
cellular nitrogen
compound metabolic
process
node3->node4
node7
GO:0008150
biological_process
node5->node7
node6
GO:0006807
nitrogen compound
metabolic process
node6->node4
node8
GO:0008152
metabolic process
node7->node8
node9
GO:0009987
cellular process
node7->node9
node8->node3
node8->node6
node9->node3