id	keyword
american_scientific_journal-5982	venom
american_scientific_journal-5982	naja
american_scientific_journal-5982	metalloprotease
american_scientific_journal-5982	snake
american_scientific_journal-5982	activity
american_scientific_journal-5982	buffer
american_scientific_journal-5982	nigricollis
american_scientific_journal-5982	hemorrhagic
american_scientific_journal-5982	research
american_scientific_journal-5982	enzyme
american_scientific_journal-5982	annona
american_scientific_journal-5982	purification
american_scientific_journal-5982	journal
american_scientific_journal-5982	scientific