public String getTranscriptId() {
		// Try transcript ID
		String trId = get("transcript_id");
		if (trId != null) return trId;

		// Try 'protein'...
		trId = get("protein_id");
		if (trId != null) return trId;

		// Try 'locus'...
		trId = get("locus_tag");
		if (trId != null) return trId;

		// Try 'db_xref'...
		trId = get("db_xref");
		if (trId != null) return trId;

		trId = get("product");
		if (trId != null) trId = trId.replaceAll("\\s", "_");

		return trId;
	}