Learn about Enzyme-Linked Immunosorbent Assay (ELISA) and its applications in detecting antigens and antibodies. Conduct an indirect ELISA test and analyze results. The experiment aims to investigate the hypothesis that there is a decrease in the spectrophotometer reading with an increase in the dilution of the well from the 1st to the 12th well. The article includes materials and methods, results and discussion, and extended learning.