test
node1
GO:0008150
biological_process
node2
GO:0008152
metabolic process
node1->node2
node5
GO:0071704
organic substance
metabolic process
node2->node5
node3
BFO:0000001
entity
node4
BFO:0000003
occurrent
node3->node4
node4->node4
node7
BFO:0000015
process
node4->node7
node6
GO:0015977
carbon fixation
node5->node6
node7->node1