The development of therapeutic antibodies involves several steps: 1. Identification of Target Antigen: The first step is to identify a suitable antigen that is associated with the disease. 2. Generation of Antibodies: Once the antigen is identified, antibodies are generated against it. This can be done through various methods such as hybridoma technology or phage display. 3. Cloning and Production: The most effective antibodies are cloned and produced in large quantities using cell culture techniques. 4. Purification and Testing: The antibodies are then purified and tested for efficacy and safety.