void initializeGroupBuild() {
		groupCount = 0;
		chains = new Chain[defaultGroupCount];
		group3s = new String[defaultGroupCount];
		seqcodes = new int[defaultGroupCount];
		firstAtomIndexes = new int[defaultGroupCount];
		currentModelIndex = -1;
		currentModel = null;
		currentChainID = '\uFFFF';
		currentChain = null;
		currentGroupInsertionCode = '\uFFFF';
		currentGroup3 = "xxxxx";
	}