Ms. Neha discusses four key areas of medical biotechnology: 1) Monoclonal antibodies which are clones of antibody-producing cells that can be "trained" to target cancer cells. 2) Bioprocessing which uses bacteria or viruses genetically modified to mass produce human proteins like insulin. 3) Stem cells which can potentially become any cell type and are being tested to treat conditions like heart attacks by replacing damaged tissue. 4) Tissue engineering to create human tissues externally for replacement, with successes in skin, cartilage and bone marrow reconstruction.