id	keyword
american_scientific_journal-833	weeks
american_scientific_journal-833	concentration
american_scientific_journal-833	fish
american_scientific_journal-833	changes
american_scientific_journal-833	mg cu
american_scientific_journal-833	copper
american_scientific_journal-833	carpio
american_scientific_journal-833	cell
american_scientific_journal-833	liver
american_scientific_journal-833	cyprinus