pH6HTN His6HaloTag® T7 Vector is designed for protein expression with an N-terminal His6-HaloTag® dual tag; pH6HTC His6HaloTag® T7 Vector is designed for protein expression with a C-terminal His6-HaloTag® dual tag. By coupling the protein solubility and labeling benefits of HaloTag® technology with the reusability and the throughput of Ni-affinity technology, the dual tag enables protein purification with the reusable Ni-resin while retaining the HaloTag® covalent binding with HaloTag® ligands.