One example is the drug Insulin, which is the current treatment for diabetes. Insulin is the product of a gene and is produced to large scale using genetic engineering methods. The insulin gene is placed next to a strong promoter and introduced into a micro-organism that turns the insulin gene into insulin protein in large amounts. The insulin protein is then purified, bottled and distributed for human use.
Synpromics has developed a more efficient means of designing promoters that can be used in processes such as these.