test
node1
BFO:0000001
entity
node2
BFO:0000003
occurrent
node1->node2
node2->node2
node7
BFO:0000015
process
node2->node7
node3
GO:0009987
cellular process
node4
GO:0008219
cell death
node3->node4
node5
GO:0012501
programmed cell death
node4->node5
node6
GO:0006915
apoptotic process
node5->node6
node8
GO:1904019
epithelial cell
apoptotic process
node6->node8
node9
GO:0008150
biological_process
node7->node9
node9->node3