code: @Override
  	public Chain getChain(String asymId, int modelnr) {
  
  		List<Chain> chains = getChains(modelnr);
  		for (Chain c : chains) {
  			if (c.getId().equals(asymId)) {
  				return c;
  			}
  		}
  		return null;
  
  	}
docs: {@inheritDoc}