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1 ( a ) Urea cycle and arginine-citrulline-ornithine interconversion pathways. CPS1 carbamoyl phosphate synthetase, OCT ornithine carbamoyltransferase, ASS argininosuccinate synthetase, ASL argininosuccinate lyase, ARG arginase, CH citrulline hydrolase, AD arginine deiminase. Red boxes indicate enzymes of the urea cycle. Blue boxes indicate enzymes of arginine-citrullineornithine interconversion. ( b ) Enzymes of the ornithine-arginine metabolism in trypanosomatids (Modifi ed from Camargo et al. ( 1978 ), Batistoti et al. ( 2001 )). + and −, indicate detectable and undetectable activity of the indicated enzyme, respectively. nd not determined. The dashed circle highlights ARG activity. ( c ) Phylogenetic tree based on SSU rRNA data of trypanosomatids obtained by Fitch and Margoliash method. The bar represents 0.01 substitution/sequence position (Modifi ed from Briones et al. 1992 )

1 ( a ) Urea cycle and arginine-citrulline-ornithine interconversion pathways. CPS1 carbamoyl phosphate synthetase, OCT ornithine carbamoyltransferase, ASS argininosuccinate synthetase, ASL argininosuccinate lyase, ARG arginase, CH citrulline hydrolase, AD arginine deiminase. Red boxes indicate enzymes of the urea cycle. Blue boxes indicate enzymes of arginine-citrullineornithine interconversion. ( b ) Enzymes of the ornithine-arginine metabolism in trypanosomatids (Modifi ed from Camargo et al. ( 1978 ), Batistoti et al. ( 2001 )). + and −, indicate detectable and undetectable activity of the indicated enzyme, respectively. nd not determined. The dashed circle highlights ARG activity. ( c ) Phylogenetic tree based on SSU rRNA data of trypanosomatids obtained by Fitch and Margoliash method. The bar represents 0.01 substitution/sequence position (Modifi ed from Briones et al. 1992 )

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