test
node1
PECO:0007241
plant nutrient
exposure
node2
PECO:0007239
micronutrient
exposure
node1->node2
node3
PECO:0007359
plant experimental
condition
node4
PECO:0001001
plant exposure
node3->node4
node6
PECO:0007191
abiotic plant
exposure
node4->node6
node5
RO:0002310
exposure event or
process
node5->node2
node7
PECO:0007189
chemical exposure
node6->node7
node7->node1
node8
BFO:0000003
occurrent
node8->node8
node9
BFO:0000015
process
node8->node9
node9->node5
node10
BFO:0000001
entity
node10->node8