Table III. Distribution of inverted and direct Alu pairs in the human genome.

Orientation of Alu pairs	Homology (%)	Number of Alu pairs with aligned regions separated by:
		0–20 bp	21–100 bp	101–500 bp
Inverted	60–80	127	1525	4772
	81–100	22	633	2483
Direct	60–80	2643	2317	5628
	81–100	1518	1094	2850

Only data for Alu repeats that are >275 bp are presented. A complete analysis of Alu distribution can be found at http://dir.niehs.nih.gov/ALU