test
node1
GO:0009987
cellular process
node2
GO:0008219
cell death
node1->node2
node7
GO:0012501
programmed cell death
node2->node7
node3
BFO:0000003
occurrent
node3->node3
node6
BFO:0000015
process
node3->node6
node4
GO:0008150
biological_process
node4->node1
node5
BFO:0000001
entity
node5->node3
node6->node4