test
node1
BFO:0000015
process
node2
GO:0008150
biological_process
node1->node2
node5
GO:0008152
metabolic process
node2->node5
node8
GO:0009987
cellular process
node2->node8
node3
GO:0044237
cellular metabolic
process
node4
GO:0006790
sulfur compound
metabolic process
node3->node4
node5->node3
node6
BFO:0000003
occurrent
node6->node1
node6->node6
node7
BFO:0000001
entity
node7->node6
node8->node3