test
node1
GO:0003674
molecular_function
node2
GO:0005488
binding
node1->node2
node4
GO:0046812
host cell surface
binding
node2->node4
node3
BFO:0000003
occurrent
node3->node3
node5
BFO:0000015
process
node3->node5
node5->node1
node6
BFO:0000001
entity
node6->node3