test
node1
BFO:0000015
process
node2
GO:0008150
biological_process
node1->node2
node3
GO:0016032
viral process
node2->node3
node4
GO:0019068
virion assembly
node3->node4
node5
GO:0098005
viral head-tail
joining
node3->node5
node7
GO:0019058
viral life cycle
node3->node7
node4->node5
node6
BFO:0000003
occurrent
node6->node1
node6->node6
node7->node4
node8
BFO:0000001
entity
node8->node6