<prompt> Antigen-antibody reaction is detected by PGI Nov 2009ELISASouthern blotNorthern blotWestern blot  <response>: Ans: A ELISA D Western blot In western blots also called immunoblots protein molecules in the sample are separated by electrophoresis blotted transferred to a membrane. The probe is a labeled antibody, which produces a band at the location of its antigen- Lippincotts Biochemistry 4th484Table Lippincotts Biochemistry: Techniques used to analyze DNA, RNA proteinsTechniqueSampleAnalysedGelUsedPurposeSouthern blotDNAQYesDetect DNA changesNorthern blotRNAYesMeasures mRNA amounts sizeWestern blotproteinYesMeasures protein amountsASODNAQNoDetects DNA mutationsMicroarrayRNA or cDNANoMeasures many mRNA levels at onceELISAproteins or antibodiesNoDetects proteins anti- genes or antibodiesProteomicsProteinsQYesMeasures abundance, distribution, post-translational modifications, functions interactions of cellular proteinsASO Allele-specific oligonucleotides 