test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node3
BFO:0000015
process
node2->node3
node6
GO:0003674
molecular_function
node3->node6
node4
GO:0016829
lyase activity
node5
GO:0016846
carbon-sulfur lyase
activity
node4->node5
node8
GO:0080146
L-cysteine
desulfhydrase
activity
node5->node8
node7
GO:0003824
catalytic activity
node6->node7
node7->node4