private boolean evaluateGetClause(String str) {
		if (str == null)
			return false;
		if (str.equals("dna") || str.equals("protein")) { // ugly handling of dna/protein part that runs outside MDModel
			model.containerScriptCallback.setScript("get " + str);
			model.containerScriptCallback.execute();
		} else {
			model.putProperty(str, useDefinitions(str));
		}
		return true;
	}