although these cells show a normal uptake of citrulline and have levels of asl comparable to a human cell line ( hela ) which can grow in citrulline-containing medium , v79 cells have less than 5 % of the argininosuccinic acid synthetase ( ass ) activity of hela and can not convert citrulline to argininosuccinate and thence to arginine .
C0003777
asl
C0003765
arginine