A connector with two flanges for making a variety of connections between structural members, in particular cold formed steel structural members, with the added utility of a accommodating a heavy bolted connection to one of the structural members with an extended tab on one flange that matches a recess on the other for optimal material consumption and minimal waste in manufacturing. The heat exchanger includes one or more features built into the design. A relatively low resolution copy of that image is obtained and stored in a datastore. Disclosed herein are preferred sites for adding cysteine residues or introducing cysteine substitutions into the proteins, and the proteins and protein derivatives produced thereby.