Fig. 1From: Expression and purification of soluble recombinant β-lactamases using Escherichia coli as expression host and pET-28a as cloning vectorThree kinds of recombinant pET-28a plasmids for each expression target (SHV-1 and TEM-1) (A, B, and C: recombinant plasmid 1, 2, and 3, respectively)Back to article page