test
node1
TO:0000112
microbial disease
response
node2
TO:0000148
viral disease
response
node1->node2
node5
CO_322:0000182
maize lethal necrosis
severity trait
node2->node5
node3
TO:0000387
plant trait
node4
TO:0000164
plant stress trait
node3->node4
node6
TO:0000179
biotic plant stress
trait
node4->node6
node7
CO_322:0000867
maize mlnsev_e_1to5
variable
node5->node7
node6->node1