1. The density of 5-ht immunoreactive cells was the highest in rectum, and then in jejunum and duodenum, moderate in ileum and intestinum caecum and the lowest in glandular stomach.
2. The density of 5-ht immunoreactive cells was the highest in rectum, and then in jejunum and duodenum, moderate in ileum and intestinum caecum and the lowest in glandular stomach.