test
node1
GO:0008150
biological_process
node2
GO:0000003
reproduction
node1->node2
node3
GO:0019953
sexual reproduction
node2->node3
node4
GO:0000747
conjugation with
cellular fusion
node3->node4
node5
BFO:0000015
process
node5->node1
node6
BFO:0000003
occurrent
node6->node5
node7
BFO:0000001
entity
node7->node6