It is common in the parlance of synthetic biology to speak in terms of forward engineering biological systems in much the same way that an electrical engineer might design and build an electronic circuit. However, biological systems are not as easily characterized or simulated as their electronic or mechanical counterparts, so real progress usually involves building and testing several variations of a genetic construct, and then performing functional tests in order to find the optimal DNA sequence that encodes the best performing biological system. For example, our customers, in efforts to produce plant variants that can better withstand drought, might wish to design a library with thousands of long constructs or “gene stacks”. Teselagen’s technology, when combined with dropping DNA synthesis costs makes this approach practical.