Researchers believe that protein 1 and protein 2 are functi…

 Researchers believe that protein 1 and protein 2 are functioning in the same complex.  They perform a Co-immunoprecipitation (Co-IP) experiment to see if that is the case. They first immunoprecipitated with an antibody against protein 1.  Subsequently they run a western blot and treat it with an antibody targeting protein 2. The result shows a band in their positive control lane but no bands in the negative control lane or their experimental lane. What is the simplest conclusion from this experiment?