There are two different cell lines but molecular biologist do not know that these cell lines have Gs or Gi proteins, associated with their G-protein...

There are two different cell lines but molecular biologist do not know that these cell lines have Gs or Gi proteins, associated with their G-protein coupled receptors. Molecular biologist wants to know about this. Can you design a experiment for him through which he would be able to identify specific Gs or Gi proteins in cell lines? You help will be appreciated.