For instance, techniques used in medical science ( bypass heart surgery, organ transplant, artificial limbs, use of drugs, antibiotics and vaccines, etc.) are not patentable.
For plant biotechnology also, a variety of culture methods, biological control of pests and weeds are not patented. There are other examples of the products of biotechnology, which can be patented.
These include products like modified antibiotics, hormones and enzymes, synthetic steroids; immobilized enzymes, organ specific drug delivery, heart valves, artificial teeth, plastic bags for blood storage, etc.
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