test
node1
PECO:0007359
plant experimental
condition
node2
PECO:0001001
plant exposure
node1->node2
node5
PECO:0007191
abiotic plant
exposure
node2->node5
node3
RO:0002310
exposure event or
process
node4
PECO:0007555
natural gas exposure
node3->node4
node8
PECO:0007189
chemical exposure
node5->node8
node6
PECO:0007149
chemical mutagen
exposure
node6->node4
node7
BFO:0000003
occurrent
node7->node7
node9
BFO:0000015
process
node7->node9
node8->node6
node9->node3
node10
BFO:0000001
entity
node10->node7