void defineStructure(int modelIndex, String structureType, char startChainID, int startSequenceNumber,
			char startInsertionCode, char endChainID, int endSequenceNumber, char endInsertionCode) {
		structuresDefined = true; // (in file)
		mmset.defineStructure(modelIndex, structureType, startChainID, startSequenceNumber, startInsertionCode,
				endChainID, endSequenceNumber, endInsertionCode);
	}