Enclosed is the package for locating well-conserved regions within a pairwise alignment. (see: Chao, K.-M., Hardison, R. C. and Miller, W. (1993) "Locating well-conserved regions within a pairwise alignment," CABIOS, 9, 387-396.) This package contains the following files: README Makefile left-right.driver.c left-right.c (for determining the region containing suboptimal alignments) robust.driver.c robust.c (for robustness measures) unique.driver.c unique.c (for uniqueness bits) region_left-right.driver.c region_left-right.c (for constrained boundaries) To make a compiled version under UNIX, type "make".