test
node1
BFO:0000015
process
node2
GO:0008150
biological_process
node1->node2
node3
GO:0009987
cellular process
node2->node3
node4
GO:0008037
cell recognition
node3->node4
node5
BFO:0000003
occurrent
node5->node1
node6
BFO:0000001
entity
node6->node5