test
node1
GO:0008152
metabolic process
node2
GO:0032259
methylation
node1->node2
node3
BFO:0000003
occurrent
node3->node3
node5
BFO:0000015
process
node3->node5
node4
GO:0008150
biological_process
node4->node1
node5->node4
node6
BFO:0000001
entity
node6->node3