ammonia levels in systemically drained isografts ( 108 +/- 5 microm/100 ml ) were more than twice those in portally drained isografts ( 38 +/- 3 , p less than 0.001 ) , while amino acid analysis showed significant elevations in glycine , serine , asparagine , histidine , phenylalanine , and tyrosine .
C0002520
amino
C0017890
glycine