code: protected Set<String> getCellularLocations(Match m, String memLabel, String comLabel)
  	{
  		PhysicalEntityChain chain = getChain(m, memLabel, comLabel);
  		return chain.getCellularLocations();
  	}
docs: Gets cellular locations of the given elements in a string set. The elements has to be a
  PhysicalEntity and they must be two ends of a chain with homology and/or complex membership
  relations.
  @param m match
  @param memLabel the member-end of the PhysicalEntity chain
  @param comLabel the complex-end of the PhysicalEntity chain
  @return cellular locations