Enter the direction of the first transmembrane section into the membrane. There is no limit on of these, record your coloring scheme. There is no maximum number of these, record your coloring scheme. The following is a low quality gif version of the image produced by the example data. The web version of the TOPO program can only display gif or postscript images.
Colors are limited to red, blue, green, yellow, aqua, brown and black.
The TOPO program was created from a graphics perspective. It is based on the limitations imposed by postscript drivers on the physical page. When the size of a starting, ending or loop portion of the sequence exceeds the limits for a single page image, additional pages are created which will then have to be manually cut and pasted onto the main page to produce a final image for publication. TOPO creates transmembrane segments of from 6 to 29 residues in length. It is limited to starting and ending sections of less than 714 residues.