a correlation was observed between histamine and histidine decarboxylase ( p less than 0.01 ) , both of them being even in the small intestine ( 11.8 +/- 2.3 ng/mg ww and 112.5 +/- 21.2 fmoles/hr/mg ww respectively ) , significantly higher in the caecum ( 16.3 +/- 1.9 and 178 +/- 20.1 ) and significantly smaller in the colon ( 7.3 +/- 1.1 and 65.3 +/- 11.5 ) than in other intestinal segments .
C0021852
small intestine
C0021853
intestinal