REGENDER graphical output. A fragment of the plot of the common L-grams for Chr4 (1 095 000-1 155 000) of RefSeq (top sequence) and Y55 (bottom sequence), where L = 32. Each line connects the starting positions of a common L-gram. The white triangles or trapezoids thus highlight non-conserved regions. Annotated mobile elements are represented by green rectangles placed just below the top line; unresolved sequences are represented by black rectangles placed just above the bottom line.