code: protected Set<String>[] getDeltaCompartments(Match m, String memLabel1, String comLabel1,
  		String memLabel2, String comLabel2)
  	{
  		PhysicalEntityChain chain1 = getChain(m, memLabel1, comLabel1);
  		PhysicalEntityChain chain2 = getChain(m, memLabel2, comLabel2);
  
  		Set<String> before = chain1.getCellularLocations();
  		Set<String> after = chain2.getCellularLocations();
  		removeCommon(after, before);
  
  		return new Set[]{after, before};
  	}
docs: Gets delta compartments of the given two PE chains. The result array is composed of two
  string sets: gained (0) and lost (1).
  
  @param m match
  @param memLabel1 the member-end of the first PhysicalEntity chain
  @param comLabel1 the complex-end of the first PhysicalEntity chain
  @param memLabel2 the member-end of the second PhysicalEntity chain
  @param comLabel2 the complex-end of the second PhysicalEntity chain
  @return delta compartments