Genetically engineered insulin for human is produced from

Genetically engineered insulin for human use is produced using the bacterium $\mathit{\text{Escherichia coli. E. coli}}$ is a commonly used host organism in biotechnology and genetic engineering processes due to its rapid growth rate and ability to express foreign genes.
In the year 1983, the American company Eli Lilly undertook the creation of two distinct DNA sequences that correspond to A and B chains found within human insulin. These sequences were then incorporated into the plasmids of E. coli. Chains A and B that were produced separately were combined through the creation of disulphide bonds to form human insulin. This genetically engineered insulin is used to treat individuals with diabetes.
(1) Pseudomonas putida a bacterium known for its ability to degrade various environmental pollutants and contaminants. It is often used in bioremediation processes to clean up oil spills, pollutants in soil and other environmental toxins.
(2) Bacillus thuringiensis (Bt) is a bacterium that produces proteins toxic to certain insect pests. It has been widely used
In organic farming and biotechnology to create insect-resistant crops. The genes from Bt have been inserted into
Plants, allowing them to produce their own insecticides and reduce the need for chemical pesticides.
(3) Rhizobium meliloti is a nitrogen-fixing bacterium that forms symbiotic relationships with leguminous plants, such as alfalfa. It helps these plants convert atmospheric nitrogen into a form that is usable by the plant, thereby enhancing soil fertility.