Affinity purification of GST fusion proteins for immunohistochemical studies of gene expression ScienceDirect 786 549 GST Protein Purification Service KMD Bioscience provides professional nanobody discovery services, apatmer screening services,peptide library construction screening and antibody development.phage display library construction service Purification Using GST HiTrap 1 mL and 5 mL Columns: GSTrap 4B, GSTrap FF, and GSTrap HP