String getPolymerSequence(int iModel, int iPolymer) {
		String sequence = "";
		Polymer polymer = frame.mmset.getModel(iModel).getPolymer(iPolymer);
		int monomerCount = polymer.monomerCount;
		for (int i = 0; i < monomerCount; i++)
			sequence += polymer.monomers[i].getGroup1();
		return sequence;
	}