The present paper describes mucous cells in the forestomach glandular regior which immunoreacted to antibovine pepsinogen serum in adult and young bac trian camels, Camelus bactrianus (female, 25 years old; female, 6 months old from Hilar Inner Mongolia, People’s Republic of China, in August 1988). Thest immunoreactive cells in forestomach glandular regions also reacted to Alciai blue (pH 1.0) and/or periodic acid-Schiff. Cross-reactivity of antibovine pep sinogen serum against extracts from the forestomach glandular region waí analyzed by Western blotting, supporting that this serum could detect pepsir and/or pepsinogen in the bactrian camel. It was suggested that mucous cells ii forestomach glandular regions produce pepsinogen molecul