preferred_name: L-lysine(in) + L-arginine(out) => L-lysine(out) + L-arginine(in)
preferred_name_lc: l-lysine(in) + l-arginine(out) => l-lysine(out) + l-arginine(in)
label: L-lysine(in) + L-arginine(out) => L-lysine(out) + L-arginine(in)
label_lc: l-lysine(in) + l-arginine(out) => l-lysine(out) + l-arginine(in)