id	keyword
abc-4022	l–1
abc-4022	et al
abc-4022	mg l–1
abc-4022	agnps
abc-4022	roots
abc-4022	wheat
abc-4022	cell
abc-4022	pcd
abc-4022	expression
abc-4022	death
abc-4022	dna
abc-4022	plant
abc-4022	silver
abc-4022	control
abc-4022	activity