Final answer:
Humanized monoclonal antibodies, or humanized mAbs, are antibodies that are mostly "human" with only the antigen-binding site being of mouse origin. They have been used in cancer treatment and show potential for the treatment of infectious diseases.
Step-by-step explanation:
Humanized monoclonal antibodies, also known as humanized mAbs, are antibodies that are mostly "human" with only the antigen-binding site being of mouse origin. They are produced in vitro using tissue-culture techniques, not in a laboratory. Humanized mAbs have been used in the treatment of cancer and have shown potential in the treatment of infectious diseases. However, their high production cost has limited their practical use in treating microbial infections.