4-aminobutanoate + L-arginine => 4-guanidinobutanoate + L-ornithine
4-aminobutanoate + l-arginine => 4-guanidinobutanoate + l-ornithine
4-aminobutanoate + L-arginine => 4-guanidinobutanoate + L-ornithine
4-aminobutanoate + l-arginine => 4-guanidinobutanoate + l-ornithine