test
node1
PECO:0007357
biotic plant exposure
node2
PECO:0007210
virus plant exposure
node1->node2
node5
PECO:0007109
ssRNA positive-strand
virus with no DNA
stage exposure
node2->node5
node3
PECO:0007359
plant experimental
condition
node4
PECO:0001001
plant exposure
node3->node4
node4->node1
node6
PECO:0007318
rice yellow mottle
virus exposure
node5->node6
node7
RO:0002310
exposure event or
process
node7->node6
node8
BFO:0000003
occurrent
node8->node8
node9
BFO:0000015
process
node8->node9
node9->node7
node10
BFO:0000001
entity
node10->node8