public String toStringAsciiArt() {
		char art[] = new char[size()];
		for (int i = start, j = 0; i <= end; i++, j++) {
			Utr utr = findUtr(i);
			if (utr != null) art[j] = utr.isUtr5prime() ? '5' : '3';
			else {
				Exon exon = findExon(i);
				if (exon != null) art[j] = exon.isStrandPlus() ? '>' : '<';
				else art[j] = '-';
			}
		}

		return new String(art);
	}