Comparison of gastrin bioactivity and immunoreactivity of antral extracts from man, pig and cat.

1. The gastrin bioactivity and immunoreactivities of human, porcine and feline antral extracts were compared. 2. Human and porcine had similar activities but cat had much less. 3. The ratio of gastrin bioactivity to immunoreactivity was much greater with feline antral extracts than with human and porcine extracts.