test
node1
TO:0000162
grain quality trait
node2
CO_321:0000153
wheat glutenin glu-b1
composition trait
node1->node2
node3
TO:0002728
fruit quality trait
node3->node1
node4
TO:0000597
plant quality trait
node4->node3
node5
TO:0000387
plant trait
node5->node4