the following atom- % 15n ' were measured in the tca-precipitable fractions on an average of the 4 test pigs : kidney = 0.20 , pancreas = 0.18 , intestinal wall tissue , duodenum = 0.18 , jejunum ( beginning ) = 0.17 , jejunum ( end ) = 0.15 , ileum = 0.15 , caecum = 0.16 , colon ( beginning ) = 0.15 , colon ( middle ) = 0.14 , colon ( end ) = 0.13 , stomach ( cardia ) = 0.11 , stomach ( fundus ) = 0.12 , spleen = 0.13 , heart = 0.12 , skin = 0.07 and skeleton muscles = 0.06 .
C0007144
cardia
C0038351
stomach