3.4.17.23 Ni3+-charged nitrilotriacetic acid-linked resin chromatography and and anti-Flag column chromatography 679708 3.4.17.23 nickel-nitrilotriacetic acid agarose affinity chromatography 682824 3.4.17.23 recombinant 692972 3.4.17.23 recombinant enzyme 762712 3.4.17.23 recombinant from CHO K1 cells 658455 3.4.17.23 recombinant from Sf21 cells as mIgG-tagged protein 657531 3.4.17.23 recombinant from Sf9 cells, to near homogeneity 659172 3.4.17.23 recombinant truncated extracellular form of human ACE2 (residues 1–740) 692972 3.4.17.23 recombinant wild-type and extracellular domain as FLAG-tagged proteins from Sf9 cells 659198 3.4.17.23 soluble ACE2, residues 19 to 615, was expressed in Sf9 cells 755534