in experiment 1 , group 1 rats received a diet containing unprocessed dry bracken powder for 3 months , group 2 received the boiling water extract of dry bracken as drinking water for 16 months , group 3 received the cold water extract of dry bracken as drinking water for 16 months , and group 4 received a diet containing the concentrated boiling water extract of dry bracken during the whole experimental period .
C0043047
water
C0599638
drinking water