test
node1
BFO:0000003
occurrent
node1->node1
node6
BFO:0000015
process
node1->node6
node2
GO:0009987
cellular process
node3
GO:0048870
cell motility
node2->node3
node4
GO:0016477
cell migration
node3->node4
node5
GO:0001667
ameboidal-type cell
migration
node4->node5
node7
GO:0008150
biological_process
node6->node7
node7->node2
node8
BFO:0000001
entity
node8->node1