ALTER TABLE mrna_db_xref ADD FOREIGN KEY (id) REFERENCES mrna(id) ON DELETE CASCADE;
ALTER TABLE mrna_exons ADD FOREIGN KEY (id) REFERENCES mrna(id) ON DELETE CASCADE;
ALTER TABLE mrna_gene_synonym ADD FOREIGN KEY (id) REFERENCES mrna(id) ON DELETE CASCADE;
ALTER TABLE mrna_introns ADD FOREIGN KEY (id) REFERENCES mrna(id) ON DELETE CASCADE;
ALTER TABLE mrna_locus_tag ADD FOREIGN KEY (id) REFERENCES mrna(id) ON DELETE CASCADE;
ALTER TABLE mrna_names ADD FOREIGN KEY (id) REFERENCES mrna(id) ON DELETE CASCADE;
ALTER TABLE mrna_note ADD FOREIGN KEY (id) REFERENCES mrna(id) ON DELETE CASCADE;