test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node9
BFO:0000015
process
node2->node9
node3
GO:0008150
biological_process
node4
GO:0009987
cellular process
node3->node4
node8
GO:0008219
cell death
node4->node8
node5
GO:0006915
apoptotic process
node6
GO:0071887
leukocyte apoptotic
process
node5->node6
node7
GO:0012501
programmed cell death
node7->node5
node8->node7
node9->node3