test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node3
BFO:0000015
process
node2->node3
node4
GO:0003674
molecular_function
node3->node4
node5
GO:0003824
catalytic activity
node4->node5
node6
GO:0016874
ligase activity
node5->node6
node7
GO:0016877
ligase activity,
forming carbon-sulfur
bonds
node6->node7